need用作情态动词

常用于否定句、疑问句和条件句中。对疑问句的肯定回答用must,否定回答用need't 。

Need I tell him everything that has happened to his parents ?

我需要告诉他有关他父母发生的一切吗？

Yes ,you must .是的，你必须告诉他 / No ,you needn't .不，没必要。


You needn't be told twice about one thing .

同一件事不必告诉你两遍。

I'll lend Peter the money if he need use it right now .

如果彼得现在需要用钱，我会借给他。


need 作实义动词

有人称和数的变化，后面要跟名词，代词，带to的不定式等，其否定式、疑问式同普通动词的变化一样。

I need to go to Beijing this Sunday to attend a book fair .

这个星期天我需要去北京参加一个书展。


Do I need to leave my telephone number and address ?

我有必要把电话和地址留下来吗？

Yes ,you need to .是的，你有必要/No ,you don't need to .不，你不必。


He needs to get some sleep.

他需要睡一会儿。

All living things need water .

所有的生物都需要水。