Perfect Infinitive

David: I wonder how the thief got into the house.
Rick: He _____________ (could/use) a ladder.

• could be used
• could have to used
• could have used
• could have using

Andrew: Or he ____________ (might/climb) that tree.

• might be climbing
• might have been climbed
• might have climbed
• might to have climbed

John: Well, he ____________ (need not/bother). There's nothing in the house to steal.

• need not to have bothered
• need not have bothered
• not need have bothered
• need not be bothered

Richard told me that he spent $4000 on a new watch for his brother, but he ____________ (must/joke) 

• must have been joking
• must be joked
• must have to joking
• must be have joked

Surely, he _____________ (can't/spend) that much on a watch.

• can't to have spended
• can't have spended
• can't have spent
• can't be spend

I think you ___________ (might/mishear) him.

• might have misheard
• might have misheart
• might have be misheard
• might have to misheard

It is 7:30 and the train arrived over an hour ago. They ________ (should/phone) us by now.

• should have phoning
• should have been phoning
• should have phoned
• should to have phoned

They ____________ (may/delay).

• may have delayed
• may have been delayed
• may be delaying
• may have been delaying

No, here they are. You __________ (need not/worry).

• need not worry
• need not to worry about it
• need not have worried
• need not have worrying

You are very sunburned. You __________ (should not/burn) if you'd used cream.

• should not have burned
• should be have burned
• should not burning
• should not have burning