有一些英语题麻烦作答

问题描述:

有一些英语题麻烦作答
按要求改写句子
1I think he needs our help.(改为否定句)
2You should eat some vegetables.(改为否定句)
3You need to see a dentist.(改为一般疑问句)
4He stayed in Beijing two weeks ago.(改为一般疑问句)

I don't think he needs our help.
You shouldn't eat any vegetables.
Do you need to see a dentist?
Did he stay in Beijing two weeks ago?