关于need的情态动词和行为动词的用法（不是很清楚）need do sth 和need to do sth ,needn't do sth和don't need to do sth ,还有need doing sth=need to be done
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关于need的情态动词和行为动词的用法（不是很清楚）need do sth 和need to do sth ,needn't do sth和don't need to do sth ,还有need doing sth=need to be done
关于need的情态动词和行为动词的用法（不是很清楚）
need do sth 和need to do sth ,needn't do sth和don't need to do sth ,还有need doing sth=need to be done
关于need的情态动词和行为动词的用法（不是很清楚）need do sth 和need to do sth ,needn't do sth和don't need to do sth ,还有need doing sth=need to be done
“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．其实我们不必担心.
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 this week．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?我需要和她一起去吗?
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
主+need +to do
主+need +doing =sth+need +to be done
(都是实义动词,注意其否定为主+don‘t/doesn't+need +to be done或主+needn’t +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",后面大多接动词原形,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.