Ответ:

1) Ben could not do all of his homework yesterday.

2) Dad did not come back from work late last night.

3) We did not enjoy the music at the party.

4) I did not get a computer game for my birthday.

5) Our lessons were not very interesting today.

Ben couldn't do all of his homework yesterday.

Dad didn't come back from work late last night.

We didn't enjoy the music at the party.

I didn't get a computer game for my birthday.

Our lessons weren't very interesting today.