Speculating - past modals

Andrew did no revision for the exam but he's passed. I think he ................................ cheated.

• can't have

• must have

• might have

• shouldn't have

I had to wait 45 minutes for a bus yesterday. There ................................ been an accident or maybe a strike

• can't have

• must have

• might have

• should have

You ................................ tried to fix the roof yourself. You might have fallen off and been badly injured.

• can't have

• must have

• shouldn't have

• might have

He ................................ arrived by now. It's only a 20 minute journey.

• can't have

• must have

• shouldn't have

• might have

He ............................ known it was your birthday. Otherwise, I'm sure he would have wished you a happy day.

• can't have

• must have

• shouldn't have

• might have

I left my bicycle in front of the library and it's disappeared. Someone ................................ stolen it.

• can't have

• must have

• should have

• might have

The concert was fantastic. You really ................................ come.

• can't have

• must have

• should have

• might have

Clara was very upset with you yesterday. You ................................ apologised for saying she was lazy.

• can't have

• must have

• should have

• might have

I'm sorry but Samantha isn't here. She ................................ already left the office.

• can't have

• must have

• should have

• might have

She ................................studied really hard. She passed all her exams with excellent grades.

• can't have

• must have

• should have

• might have