1.He said he must set up a company of his own.
可不可以写成:He said he must set up his own company.
2.I had to buy a gift for him yesterday.等于?I must bought a gift for him yesterday.
3.He must be from the States.可不可以写成:He must be a American.
4.see(seen)和meet(met)是一样的可以互换的吗?有什么区别吗?
5.-Must we hand in our assignments tomorrow?
-No,you needn't./Yes,you must.
这个为什么用need做否定?
英语不好啊~==希望大家来帮帮我~谢谢啦~