1 I read the letter
2 I went to school
3 I ate my breakfast
4 I won a prize
5 She didn’t think about the future
6 He didn’t find his book
7 I didn’t understand him
8 I didn’t try an experiment
9 Did you go for a walk with your friend?
10 Did you buy a chocolate cake?
11 Did she agree with you?
12 Did he give his telephone number?