Past modals for degrees of certainty

He _______________________ the party.

• couldn't have forget

• could have forgotten

• couldn't have forgotten

• have forgotten

Their car _______________ down.

• might have broke

• could have broken

• have break

• couldn't have broken

We ____________ a meeting with a client.

• must have had

• have had

• have

• may have had

He ____________________ in the office.

• must not have been

• coulldn't have been

• have been

• might not have be

She __________________ home today.

• might have stayed

• must had stayed

• might not have stay

• may stay

Our son promised to clean his room, but it is still messy. He _________________ it.

• may not had cleaned

• most have cleaned

• could have clean

• couldn't have cleaned

Juan's class starts at 7:00. It's 7:45 and he's not here yet. He _________________.

• may not have be tired

• might have missed the bus

• could have driven to the CEC

• must have been sick

My white shirt now has green streaks in it. I ____________________ it properly.

• may had washed

• must have washed

• couldn't have washed

• must have boughtt new shirt

Bryan got a call and looked happy. He ____________________ good news.

• may had heard

• must have heard

• couldn't have heard

• must not have heard

I can't find my glasses. You _____________ them at the office.

• can't have left

• have leave

• could have leave

• might have left