Modals of deduction: present and past

Their car is parked outside their house. They ______ at home.

• must be

• must have been

I can't see their car in front of the house. They _______.

• must leave

• must have left

She is not answering her phone. She ______ asleep.

• could be

• could have been

I can't find my phone. I _______ it on the bus.

• might leave

• might have left

They're late. They __________ the bus.

• may miss

• may have missed

I _______ into town. I need some fresh air.

• may walk

• may have walked

Chris sounded really annoyed on the phone. - Well, he _______ an argument with his wife.

• might have

• might have had

Jane _________ the truth - she always knows everything.

• might know

• might have known

Matt said he would call me but he didn't. - He _____ your number.

• might lose

• might have lost

There are no lights on in their house, They ________ to bed already.

• could go

• could have gone