1.The boy looked at his sister`s present.But he did not take any sweet.(возможно и could. если он по какой -то причине не смог взять конфету..)
2.Miss Chater could not write the letter yesterday.She was too busy.
3 Did you play this computer game yesterday?-No,we did not.We were in the zoo.
4. Were you at home two hours ago?-Yes,I was.
5.I could not dive last summer.Now I can.