don"t need和don't have to 的区别?
don"t need和don't have to 的区别?
1.You____ return the dictionary now.You can keep it till next week if you like.
A.can't B.mustn't C.don't need D.don't have to
2.You mustn't finish the work now.There's plenty of time.(改错)
两题的意思不是都差不多吗?为什么在正确答案里,第一题选的是don't have to而第二题是把mustn't改成needn't 不能改成don't have to