what did they do?what must they do?都是过去式么

what did they do?what must they do?都是过去式么 请教what must they do What did they do yesterday? what did they do finally? what did they do next? what did they do first? what do they do? what do they do they What must they do?They must have a hoilday.标 What did they do at the weekend? What did they do?该怎么回答 What did they do this morning