有几题英语题不会 求解释 我会给分的................................................................

1. He didn't send any email to his friend three days ago.
Did he send any email to his friend three days ago?
Yes, he did.
No he didn't.
What did he send to his friend three days ago?
2. There weren't about seven hundred students in their school.
Were there about seven hundred students in their school?
How many students were there in their school?
3.My neighbour didn't look after my pet dog during my holiday
Did My neighbour look after my pet dog during my holiday?
Who looked after my pet dog during my holiday?
4.The young man didn't put on his coat after the meeting.
Did the young man put on his coat after the meeting?
What did the young man do after the meeting?

第一个答的 而且在时间内 希望加分！

1.did he sent an email to his friend three years ago?
he didn't send an email to his……
did he sent……
yes,he did
no,he didn't
what did he sent three days ago
给分吧