Shall I tell John about it?的否定回答的答案是,No,you needn't.和No,you don't have to.

问题描述:

Shall I tell John about it?的否定回答的答案是,No,you needn't.和No,you don't have to.
可我认为应该是:No,you can't.

No,you needn't.和No,you don't have to.语气较为婉转,而No,you can't.则显得比较生硬,欠礼貌.