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English grammar

Conditional Alternatives: unless, as long as, provided

Updated 27 Oct 2026 5 min read LingoLadder Editorial Team
Cover: Conditional alternatives — unless, as long as, provided, in case, even if
Short answer

English has many ways to set a condition apart from 'if'. Unless means 'if not'; as long as and provided (that) mean 'only on the condition that'; in case means 'as a precaution', not 'if'. Each links a condition to a result.

On this page10 sections · tap to jump
  1. 01The rule
  2. 02Forms
  3. 03Example sentences
  4. 04Common mistakes
  5. 05A short conversation
  6. 06Usage notes
  7. 07Compared with…
  8. 08Practice
  9. 09Quiz
  10. 10Recap cheat-sheet

Level: B2. You already build conditionals with if. Now you can swap if for linkers that sharpen the meaning: an exception (unless), a strict requirement (as long as, provided that), a precaution (in case), or a concession (even if).

The rule

A conditional joins a condition to a result. The word if is neutral. The alternatives below each add a shade of meaning, so choosing the right one makes your sentence more precise.

Unless means if not or except if. “I won’t go unless you come” = “I won’t go if you don’t come.” Because unless already contains the negative not, you do not add a second negative to the same clause. Use it for the one exception that would change the result.

As long as, so long as, provided (that), providing (that) and on condition that all mean only on the condition that. They state a strict requirement — the result is true only while the condition holds. They are common in rules, promises and agreements: “You can stay as long as you pay the rent.”

In case is the one that trips people up. In case + present simple means as a precaution against a possible future problem — you do the action first, before any problem appears. “Take an umbrella in case it rains” means take it now, because rain is possible; it does not mean “take it if it rains”. Even if concedes a condition: the result stays the same whatever happens (“I’m going even if it rains”). Otherwise means if not but links to a consequence: “Hurry, otherwise we’ll be late.”

Forms

Linker Meaning Typical pattern Example
unless if not / except if unless + present, … will … Unless you leave now, you’ll miss it.
as long as / so long as only on condition that … as long as + present You can borrow it as long as you return it.
provided (that) / providing strict requirement provided (that) + present I’ll sign, provided that you pay today.
on condition that formal requirement … on condition that + clause He agreed on condition that we kept it secret.
in case as a precaution (beforehand) … in case + present Save your work in case the power cuts out.
even if concession (result unchanged) even if + clause, … Even if it rains, the match goes ahead.
whether or not in both cases whether or not + clause We’ll decide whether or not she agrees.
otherwise if not → consequence …, otherwise … Write it down, otherwise you’ll forget.

Most of these clauses take the present simple for a future meaning, exactly like the first conditional — you do not use will in the condition clause: “provided that you arrive”, not “provided that you will arrive”.

Example sentences

  1. You won't pass unless you study.
    Unless = if you don't study. The one exception.
  2. Unless it rains, we'll eat in the garden.
    Condition-first; comma before the main clause.
  3. I'll lend you the car as long as you drive carefully.
    A strict requirement for lending it.
  4. You can stay so long as you're quiet after ten.
    So long as = as long as, slightly more informal.
  5. I'll help you, provided that you ask politely.
    Provided that sets a firm condition.
  6. Providing you keep the receipt, you can return it.
    Providing without 'that' is fine.
  7. The bank lent the money on condition that the house was insured.
    On condition that is formal; common in contracts.
  8. Take a jacket in case it gets cold tonight.
    In case = a precaution you take now.
  9. I'll write down the address in case I forget it.
    The action happens before any problem.
  10. We're going even if the weather is terrible.
    Even if concedes: the result does not change.
  11. Even if she apologised, I wouldn't forgive her.
    Even if with a hypothetical past-simple condition.
  12. We'll leave at six whether or not you're ready.
    Whether or not covers both possibilities.
  13. Hurry up, otherwise we'll miss the train.
    Otherwise = if we don't hurry.
  14. Keep your passport safe; otherwise you can't travel.
    Otherwise links a condition to its consequence.
  15. You may use the pool as long as an adult is present.
    A rule stated with a condition.
  16. I won't sign unless I read the contract first.
    Unless marks the single blocking exception.
  17. Bring cash in case the card machine is down.
    A precaution against a possible problem.
  18. Provided the flight is on time, we'll land by noon.
    Provided without 'that'; present simple condition.
  19. Even if you paid me, I wouldn't do it.
    Strong refusal; even if raises the stakes.
  20. You can come with us as long as you don't complain.
    The negative sits inside the as-long-as clause, not with unless.
  21. Unless there's a delay, the meeting starts at nine.
    Unless + there's: the default plan with one exception.
  22. Take notes in case you need them for the exam.
    A forward-looking precaution, not a plain 'if'.

Common mistakes

  • ❌ Unless you don’t hurry, we’ll be late. → ✅ Unless you hurry, we’ll be late. Unless already means if not; adding don’t creates a double negative.
  • ❌ Take an umbrella if it rains. (when you mean a precaution) → ✅ Take an umbrella in case it rains. If waits for the rain; in case takes the umbrella now, as a precaution.
  • ❌ I’ll help you provided that you will ask. → ✅ I’ll help you provided that you ask. Use the present simple in the condition clause, not will.
  • ❌ You can stay as long as you will be quiet. → ✅ You can stay as long as you are quiet. Same rule: present simple after as long as.
  • ❌ We’re going even it rains. → ✅ We’re going even if it rains. Even alone is not a conditional linker; you need even if.
  • ❌ Hurry up, unless we’ll be late. → ✅ Hurry up, otherwise we’ll be late. For “if not, then this bad result”, use otherwise, not unless.

A short conversation

A: Can I borrow your bike this weekend? B: Sure, as long as you lock it properly. A: Of course. I’ll bring my own lock in case yours is missing. B: Good. Just don’t ride it in the rain — unless you really have to.

Usage notes

  • Present simple in the condition. After unless, as long as, provided, in case and the rest, use the present simple for future meaning, just like the first conditional: “provided that you arrive on time”.
  • Comma placement. When the condition comes first, put a comma before the main clause (“Unless you hurry, we’ll be late”). When it comes second, no comma (“We’ll be late unless you hurry”).
  • Register. Provided that and on condition that sound formal and are typical of contracts and rules. As long as and so long as are everyday. Providing and provided work with or without that.
  • Unless and hypotheticals. Unless usually appears in real conditionals. For unreal situations, speakers often prefer if … not: “If I weren’t so tired, I’d come” is more natural than “unless I were so tired”.

Compared with…

  • First conditional uses plain if for a real, likely future: “If you study, you’ll pass.” The alternatives refine that same real conditional — unless for the exception, as long as/provided for the requirement. See First Conditional (Real Future Possibility).
  • Mixed conditionals join a past condition to a present result (or the reverse) and keep if: “If I had saved, I would be richer now.” The linkers here are about real conditions, not mixed-time unreal ones. See Mixed Conditionals.

Recap card for the English conditional alternatives lesson listing unless, as long as, provided and in case with their meanings

Quick recap before you practise.

Practice

Practice

Conditional alternatives practice

Try each one, then press Check. No sign-up, nothing is sent anywhere — it all runs in your browser.

1 Which sentence is correct?
Show answer

Unless you book, you'll lose the seat. — Unless already means 'if not', so no second negative and no 'will' in the condition.

Hint: a precaution taken beforehand

Show answer

in case — In case = as a precaution before a possible problem, not 'if'.

3 Put the words in order to make a correct sentence.

Show answer

You can stay as long as you are quiet — as long as + present simple states the condition for staying.

4 Match each linker to its meaning.

  • unless
  • provided that
  • in case
  • even if
Show answer
  • unless → if not / except if
  • provided that → only on the strict condition that
  • in case → as a precaution beforehand
  • even if → the result does not change

Each linker adds a different shade to a plain 'if'.

5 Choose the natural sentence for 'if we don't leave, we'll be late'.
Show answer

We'll be late unless we leave. — Unless = if not: 'unless we leave' = 'if we don't leave'.

Hint: sets a strict condition

Show answer

provided — Provided (that) / providing (that) states a firm requirement.

Quiz

Check yourself

Conditional alternatives quiz

13 questions · pick an answer and you'll see straight away if it's right.

0/13 0 answered
  1. 1Complete: '___ you hurry, we'll miss the bus.'
    Show answer

    Unless — Unless = if not: if you don't hurry, we'll miss it.

  2. 2Which sentence is WRONG?
    Show answer

    Unless you don't call, I'll assume you're not coming. — 'Unless you don't call' is a double negative; unless already means 'if not'.

  3. 3Pick the precaution meaning: 'I'll take my phone ___ I need to call someone.'
    Show answer

    in case — In case = take the phone now, as a precaution against a possible need.

  4. 4Complete: 'You can borrow it ___ you give it back tomorrow.'
    Show answer

    as long as — As long as sets the condition for borrowing it.

  5. 5Which is correct after 'provided that'?
    Show answer

    provided that you pay — Use the present simple in the condition clause, not 'will'.

  6. 6Choose the concession: 'I'm buying it ___ it's expensive.'
    Show answer

    even if — Even if concedes the condition: the result stays the same.

  7. 7Complete: 'Write the number down, ___ you'll forget it.'
    Show answer

    otherwise — Otherwise = if not → consequence: if you don't, you'll forget.

  8. 8What does 'Take a coat in case it's cold' mean?
    Show answer

    Take the coat now as a precaution. — In case means you act now, before any cold weather appears.

  9. 9Which means the same as 'if you don't book early'?
    Show answer

    unless you book early — Unless = if not, so 'unless you book early' = 'if you don't book early'.

  10. 10Complete (formal): 'The loan was granted ___ that the car was insured.'
    Show answer

    on condition — On condition that states a formal, strict requirement.

  11. Show answer

    unless — Unless = if not, replacing the negative if-clause.

  12. 12Which sentence correctly covers both possibilities?
    Show answer

    We'll go whether or not it rains. — Whether or not covers both outcomes: rain or no rain.

  13. 13Correct the error: 'You can play outside as long as you will wear a coat.'
    Show answer

    as long as you wear a coat — Use the present simple after 'as long as', not 'will'.

Recap cheat-sheet

Linker Means Watch out
unless if not / except if no second negative in the clause
as long as / provided only on condition that present simple, not ‘will’
in case precaution beforehand not a swap for ‘if’
even if / whether or not result unchanged concedes the condition
otherwise if not → consequence links to a bad result

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125 topics 125 ready now
A1 30 topics · 30 ready
  1. 01 Verb 'To Be' in the Present (am, is, are)
  2. 02 Subject Pronouns: I, You, He, She, It, We, They
  3. 03 Present Simple: Affirmative and the -s Ending
  4. 04 Present Simple: Negatives and Questions (do/does)
  5. 05 Articles: a / an and When to Use Each
  6. 06 The Definite Article 'The': When to Use It
  7. 07 Zero Article: When to Use No Article
  8. 08 Plural Nouns: Regular and Irregular Forms
  9. 09 This, That, These, Those (Demonstratives)
  10. 10 Possessive Adjectives: my, your, his, her
  11. 11 Possessive 's and s' (Showing Belonging)
  12. 12 There Is / There Are (Saying What Exists)
  13. 13 Have Got: Talking About Possession
  14. 14 Can and Can't for Ability
  15. 15 Present Continuous (am/is/are + -ing)
  16. 16 Imperatives: Giving Orders and Instructions
  17. 17 Adjectives: Position and Basic Use
  18. 18 Prepositions of Place: in, on, at
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  20. 20 Question Words: What, Where, When, Who, Why, How
  21. 21 How Much vs How Many
  22. 22 Countable and Uncountable Nouns
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  25. 25 Adverbs of Frequency and Their Position
  26. 26 Like, Love, Hate + -ing (Expressing Preferences)
  27. 27 Would Like: Polite Wants and Offers
  28. 28 Making Requests: Can, Could, May I
  29. 29 Past Simple of 'To Be' (was / were)
  30. 30 Let's and Shall We: Making Suggestions
A2 25 topics · 25 ready
  1. 31 Past Simple: Regular Verbs and -ed Spelling
  2. 32 Past Simple: Irregular Verbs (go, see, have)
  3. 33 Past Simple: Negatives and Questions (did)
  4. 34 Comparative Adjectives (bigger, more expensive)
  5. 35 Superlative Adjectives (the biggest, the most)
  6. 36 Going To: Plans and Predictions
  7. 37 Will: Predictions, Decisions and Offers
  8. 38 Present Continuous for Future Arrangements
  9. 39 Present Perfect for Experience (ever / never)
  10. 40 Present Perfect with just, already, yet
  11. 41 Present Perfect vs Past Simple
  12. 42 Have To and Don't Have To (Obligation)
  13. 43 Should and Shouldn't for Advice
  14. 44 Could: Past Ability and Polite Use
  15. 45 Much, Many, A Lot Of
  16. 46 A Few, A Little, Few, Little
  17. 47 Adverbs of Manner (quickly, well, hard)
  18. 48 Verb + -ing or Verb + to (Introduction)
  19. 49 Zero Conditional (Facts and Rules)
  20. 50 First Conditional (Real Future Possibility)
  21. 51 Prepositions of Movement (to, into, through)
  22. 52 Possessive Pronouns: mine, yours, hers
  23. 53 Past Continuous (was/were + -ing)
  24. 54 Too and Enough (Degree)
  25. 55 Order of Adjectives Before a Noun
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  1. 56 Past Continuous vs Past Simple
  2. 57 Used To and Would for Past Habits
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  4. 59 Present Perfect: Simple vs Continuous
  5. 60 Past Perfect (had + past participle)
  6. 61 Second Conditional (Unreal Present/Future)
  7. 62 Third Conditional (Unreal Past)
  8. 63 Reported Speech: Statements (Backshift)
  9. 64 Reported Questions
  10. 65 Reported Commands and Requests
  11. 66 Passive Voice: Present and Past Simple
  12. 67 Must and Mustn't (Strong Obligation)
  13. 68 May, Might, Could for Possibility
  14. 69 Defining Relative Clauses (who, which, that)
  15. 70 Non-Defining Relative Clauses (with commas)
  16. 71 Gerunds and Infinitives: Full Verb Patterns
  17. 72 Verbs Where -ing vs to Changes Meaning
  18. 73 Future Continuous (will be -ing)
  19. 74 So and Such (Emphasis)
  20. 75 As...As Comparisons (equality)
  21. 76 Question Tags (isn't it? do you?)
  22. 77 Phrasal Verbs: Separable and Inseparable
  23. 78 Linking Words: because, so, although, but
  24. 79 Infinitive of Purpose (to / in order to)
  25. 80 Indirect Questions (Can you tell me...)
  26. 81 Make, Let, Allow, Help (Causatives Intro)
  27. 82 Be Used To and Get Used To (+ -ing)
B2 25 topics · 25 ready
  1. 83 Narrative Tenses for Storytelling
  2. 84 Past Perfect Continuous (had been -ing)
  3. 85 Mixed Conditionals
  4. 86 Wish and If Only (Regrets and Wishes)
  5. 87 Wish/If Only + would (Complaints)
  6. 88 Passive Voice: All Tenses and Modals
  7. 89 Reporting Passive (It is said that / is said to)
  8. 90 Causative: Have/Get Something Done
  9. 91 Reduced Relative Clauses (Participles)
  10. 92 Modals of Deduction: Present and Past
  11. 93 Needn't Have vs Didn't Need To
  12. 94 Future Perfect (will have done)
  13. 95 Participle Clauses (-ing / -ed / having done)
  14. 96 Advanced Comparatives (far/much + er, the more)
  15. 97 Conditional Alternatives: unless, as long as, provided You are here
  16. 98 Advanced Determiners: each, every, either, neither
  17. 99 Intensifiers and Adverbs of Degree
  18. 100 Advanced Contrast: despite, in spite of, however
  19. 101 Advanced Linkers: therefore, moreover, consequently
  20. 102 Advanced Article Use (generalisations, names)
  21. 103 Verb + Preposition and Adjective + Preposition
  22. 104 Relative Clauses: whose, where, when, quantifier + whom
  23. 105 Subject-Verb Agreement: Tricky Cases
  24. 106 Emphatic Do (I do like it)
  25. 107 Would for Past Habits (Formal Narrative)
C1 18 topics · 18 ready
  1. 108 Inversion with Negative Adverbials
  2. 109 Inversion in Conditionals (Had I known)
  3. 110 Cleft Sentences (It was... / What I need is...)
  4. 111 Fronting and Emphasis (Word Order)
  5. 112 Subjunctive and Mandative (I suggest he be)
  6. 113 Ellipsis and Substitution (so, do, one)
  7. 114 Hedging and Cautious Language
  8. 115 Nominalisation (Academic Noun Style)
  9. 116 Advanced Discourse Markers (Spoken & Written)
  10. 117 Advanced Passive (passive + infinitive, get-passive)
  11. 118 Advanced Comparative Structures (no sooner...than)
  12. 119 Future in the Past (was going to / would)
  13. 120 Advanced Modals (may well, might as well, would rather)
  14. 121 Advanced Reported Speech (Reporting Verbs + Patterns)
  15. 122 Advanced and Idiomatic Phrasal Verbs
  16. 123 Collocation and Colligation (Natural Combinations)
  17. 124 Advanced Concession (much as, whatever, however + adj)
  18. 125 Absolute and Non-Finite Clauses (Formal)