Past modals
Must have been waiting, should have been told, needn't have vs didn't need to, could have.
At C1, past modals go one step further: continuous and passive forms, and the difference between needn't have and didn't need to. Let's crack it!
Certainty and possibility
modal + have + past participle
Criticism, regret and missed chances
needn't have vs didn't need to
A classic C1 trap.
Continuous and passive forms
C1 answers often add been.
How it comes up in Part 4
In Part 4 you complete the second sentence with the key word, so that it means the same as the first one (3–6 words).
MUST
She must have been joking when she said that.
Sure + a continuous action in the past: must have been + -ing.
NEEDN'T
We needn't have taken a taxi.
We did it, but it wasn't necessary: needn't have + past participle.
OUGHT
We ought to have booked the tickets in advance.
The right thing, not done: ought to have + past participle.
Common mistakes
- ✗ We needn't have gone, so we stayed at home.✓ We didn't need to go, so we stayed at home.Needn't have = you did it. If you didn't do it, use didn't need to.
- ✗ She mustn't have heard me.✓ She can't have heard me.For certainty that something didn't happen, use can't have.
- ✗ He should have be told.✓ He should have been told.The passive needs have been + past participle.
Check whether the action was continuous (must have been waiting) or passive (should have been told). Those extra words often make the difference between 2 marks and 0.
Quick check
Complete the second sentence so that it means the same as the first. Use the key word and write 3–6 words.
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