need”作为情态动词的用法
一、need表示“需要”或“必须”,通常用于否定句,疑问句,条件句.例如：1．You needn't do it again．你不需要重复做了.2．He needn't worry about it．这件事他无需担心.3．Need he do this homework first?他需要先做这些作业吗?4．Need they fill in the form?他们需要填表吗?二、在否定句中,可以用need的否定形式＋不定式完成体.例如：1．We needn't have worried．其实我们不必要慌.2．You needn't have mentioned it．你本来不必提起这件事.3．You needn't have said that when he asked．当他问的时候,你其实不必要说.三、needn't后的不定式间或也能用进行式或被动语态.例如：1．He needn't be standing in the rain．他不必要站在雨中.2．We needn't be waiting in this place．我们不必要在这儿等.3．The hedges needn't be trimmed thisweek．本周树蓠不必要整修.四、其一般疑问句的答语,肯定用must,否定用needn't.Need I go with her?我需要和他一起去吗?Yes,you must.是的,你需要去.No,you needn't.不,你不必去.
编辑本段“need”作为实义动词时,通常用法是
人＋need ＋to do 物＋need ＋doing 物＋need ＋to be done 例如：The room needs cleaning = The room needs to be cleaned.房间需要打扫了.另外,“need”作实义动词时后还可以直接跟名词.请看下面的例子：It is a question that needs very careful consideration．这是一个需要慎重考虑的问题 很简单的方法区别情态动词与实义动词：当need为情态动词时,意思是“必要”,否定为"needn't",后面大多接动名词,表示动作； 当need为实义动词时,意思是“需要”,否定为"don't need",后面大多跟名词.
