need和should有什么区别？
它们之间的区别在于词义不同：
需要need
should在义务上应该是道德上的，应该是合理的.
列子：1.（Must）I return the book to you today?
No.you(needn't).You(can )keep it till tomorrow.
2.( Must) I buy film tickets for you?
No,you（needn't）
3.You (must) not talk in class and you (must) listen carefully.
4.You look tired .YOu (need) have some sleep.
5.We (shouldn't ) watch TV so much.
6.We have got plenty of time.We ( needn't)hurry
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