Past perfect:
1)they thought that letters had been sent.
2)we saw that everybody had already gone.
3)i put on me clothes after i got up.
4)the students said that he hadn't done his homework.
5)when had the telephone rang?
6) Had mommy cooked the dinner when her children came home?
7)Had teacher checked the tests before she left for home?
8)our friends said that they hadn't passed the exams yet.
9) she hadn't ear anything before she went to bed.
10)If students had prepared for an exam they would pass it successfully.
Past simple:
1 He did it very well
2I slept for two hours
3I went to Italy last month
4 We played football
5You did the right thing
6We were on holiday7 She was really angry
8 The boys stayed at home
9I went to the cinema yesterday evening
10We had breakfast an hour