Dokonaj spekulacji na temat przeszłości.

I'm sure he locked the door. - He   (LOCK) the door.

I'm sure my father wasn't there. - He   (BE) there.

I think he did that but I'm not sure. - He   (DO) that.

It's possible they got lost. - They  . (GET LOST)

I am certain he forgot about the meeting. - He   (FORGET) about the meeting.

I know she didn't give me the book back. - She   (GIVE) me the book back.

John got a bad mark from the test but he studied. - He   (UNDERSTAND) the subject.