помагите...........,.............,..,,,,..,.........

1 They didn't send the letter yesterday

2 He didn't become famous

3 They didn't used to go there

4 We didn't used to spend much money on cassettes

5 She didn't used to play the piano much.

6 I didn't used to go to the theatre every Sunday

7 He didn't used to travel by train

8 They didn't have to take a taxi

9 He won't understand it

10 We shan't walk to the station