EF Upper-Intermediate Unit 7&8

Help

I am almost sure you left your phone in the restaurant. (MUST)

You must have left your phone in the restaurant.

Why didn't you tell me that it was your birthday? (SHOULD)

You should have told me that it was your birthday.

I am sure that the backpackers haven't got lost. (CAN'T)

The backpackers can't have got lost.

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