Modal verbs

She ... left the letter unanswered.

He ... forgotten about the concert.

Irene ... failed to receive their letter.

I ... lost her address.

... he have translated the text without making a single mistake?

He ... studied at the University.

Eliza ... have spent part of the summer in the Crimea.

His aunt ... met them at the station.

They ... been at home.

He ... have spoken to them about it.

She ... more careful.

I think you ... have let him know about his arrival.

You ... given him a piece of good advice.

He ... pay attention to written exercises.

They ... have had no chance to warn you about their departure.