Unless, As Long As and Provided That helps you communicate about exceptions, necessary safeguards and formal conditions. Start with the meaning, notice the pattern, and then use it in complete sentences.
By the end of this lesson, you can
- I can state conditions precisely using unless, as long as and provided that.
- Recognise and build the form: unless = if not; as long as/provided that + condition.
- Use the pattern accurately in a meaningful sentence.
Meaning and use
Use Unless, As Long As and Provided That for exceptions, necessary safeguards and formal conditions. Always read the whole situation before choosing the form: grammar expresses a meaning, not only a pattern.
We won't start unless everyone is ready.
'Unless' means 'if not': we start only when everyone is ready.
You can borrow the car as long as you drive carefully.
'As long as' introduces a condition that must be satisfied.
The refund is available provided that you keep the receipt.
'Provided that' introduces a formal necessary condition.
unless = if not; as long as/provided that + conditionKeep this pattern visible while you study the examples. Then cover it and rebuild one example from memory.
Key rules to notice
These rules explain why the form is correct. Focus on the subject, auxiliary, verb form, word order and time or meaning clues.
- 'Unless' means 'if not': we start only when everyone is ready.
- 'As long as' introduces a condition that must be satisfied.
- 'Provided that' introduces a formal necessary condition.
- 'Unless you tell me' means 'if you do not tell me'.
- The result is possible on the condition that no problems arise.
Common mistakes
Not:We won't start if everyone is ready.
Use:We won't start unless everyone is ready.
'Unless' means 'if not': we start only when everyone is ready.
Not:You can borrow the car unless you drive carefully.
Use:You can borrow the car as long as you drive carefully.
'As long as' introduces a condition that must be satisfied.
Not:The refund is available unless you keep the receipt.
Use:The refund is available provided that you keep the receipt.
'Provided that' introduces a formal necessary condition.
Check before you practise
Complete each sentence mentally, then reveal the answer.
I won't know about the change ____ you tell me.
unless
'Unless you tell me' means 'if you do not tell me'.
We can finish today ____ no new problems arise.
as long as
The result is possible on the condition that no problems arise.
Applicants may join ____ they meet all the requirements.
provided that
Use 'provided that' for a formal eligibility condition.