Ответ:

1) He worked at a factory/ He didn't work at a factory/ Did he work at a factory?

2) She slept after dinner/ She didn't sleep after dinner/ Did she sleep after dinner?

3) We worked part-time/ We didn't work part-time/Did you work part-time?

4) Mike was a student/Mike wasn't a student/ Was Mark a student?

Объяснение:

Утвердительная форма Past Simple: V2

Негативная форма: did not + V1

Вопросительная форма: did/.... /V1...?