Answer Key
Exercise
Complete the following sentences with the correct form of the verb in brackets...
- I really haven't [been able to] (BE ABLE) study lately because of my terrible headaches.
- I don't know why she isn't here yet – she [might have left] (MIGHT LEAVE) work late.
- You called twice! I didn't hear the phone – I [must have been] (MUST / BE) asleep!
- You [mustn't, must not] (MUST) get there - that area is restricted!
- You [can't have seen, cannot have seen, could not have seen, couldn't have seen](CAN / SEE) her downtown last night. She's been out of the country since Tuesday.
- I'm so sorry I [couldn't, could not] (CAN) come, but my cat was in a tree and I had to help her get down.
- [were] you [allowed to] (BE ALLOWED) change anything in the document?
- Don't be so hard on yourself - there was nothing you [could have done] (CAN / DO) for him anyway - it was too late to save him.
- Anne [didn't have to, did not have to] (HAVE TO) prepare anything for the meeting last Monday; everything had been prepared by her assistant.
- I [shouldn't have had, should not have had] (SHOULD / HAVE) those last three beers - now I can't take the car home.