Can/Could Exercise

Level: B2

Use the verb can in the correct form followed by the appropriate infinitive:

Have you a friend whom ... you ... (to trust) for all your life?
What … he (to do) all this time? He has been gone for twenty minutes.
He … not (to see) me. I came when he had gone.
How … you (to make) such a mistake as to suppose that I was a lier?
Surely you ... (to do) it before. What have you been doing all the day?
The work ... not (to do) in an hour.
Our house was built on the top of the hill and ... (to see) from afar.
I ... not (to sleep) two hours, I still feel tired.
He ... not (to be) her twin brother: he is too slim.
They ... not (to hear) us. Knock again.
If you had asked me for money I... (to lend) yousome.
He ... (to help) me but he refused to.
13.He still not … (to sleep)? It seems to me it is too late.
I … (not /to dance) — I wish I … .
She has a university education and ... (to make) a career for herself if she hadn’t married.
You not (to forget). I don’t believe you.
She was not well. She ... ( not leave) her cabin.
Negotiators ... discuss it now, clause by clause.
My son is not in town; but he will be before long. … I (to give) him any message?
She ... (to win) but, unfortunately she lost.
She … (to enjoy) the performance as it was boring
He is in the next room, and he... ( to lie) on the sofa now.
What … (to happen) to change him so much?
… there … (to be)any misunderstanding in our first encounter?
A policeman arrived and told him he ... ( not to park) there.
… he … (to steal) a bracelet? Do you think it possible?
How did he get to know it? Who ... he ( to talk) to?
“There’s no such train.” “We came by it.” “You... (to do).”
“Life,” the old man said, “can only be understood backward. Now I see clearly all the mistakes I made and ... (to avoid).”
Really he had no idea that she ... (to use) watercolour as well as that.