need和needn't有什么区别？
1、结构不同
need to be done：实意动词+介词+助动词+动词现在分词。
need doing：实意动词+动名词。
2、用法不同
need to be done：need用作实意动词时，可用于肯定句、否定句、疑问句等各种句式，有动词的全部变化形式接to be done。
need doing：need用作实意动词的基本意思是缺少急切需要的东西，强调急需接doing。
扩展资料
need的用法
一、情态动词的用法
1、need表示“需要”或“必须”，通常用于否定句、疑问句、条件句。例如：You needn't do it again. 你不需要再做了。
2、在否定句中，可以用need的否定形式+不定式完成体。例如：We needn't have worried. 其实我们不必要慌。
3、needn't后的不定式间或也能用进行式或被动语态。例如：He needn't be standing in the rain. 他不必要站在雨中。
4、其一般疑问句的答语，肯定用must，否定用needn't。例如：Need I go with her? 我需要和他一起去吗？
二、“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
三、另外，“need”作实义动词时后还可以直接跟名词。例如：It is a question that needs very careful consideration. 这是一个需要慎重考虑的问题。
四、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。
sth. need doing=sth. need to be done
例如：The room needs cleaning=The room needs to be cleaned. 房间需要打扫了。
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绛旓細He needn't have done it.(浠栨湰涓嶉渶瑕佸仛杩欎欢浜嬨)瑙ｆ瀽锛氬彞瀛愪富骞茬粨鏋勪负鈥滀富璋撳鈥濓紝鍏朵腑 needn't have done 涓衡滆皳璇姩璇嶁濅娇鐢ㄢ滄儏鎬佸姩璇 need + 瀹屾垚寮忊濈粨鏋勶紝琛ㄧず鈥滄湰涓嶉渶瑕佸仛浣嗗仛浜嗏濈殑鐢ㄦ硶銆俷eed 浣滀负鈥滃悕璇嶁濓紝鈥滃彲鏁板悕璇嶁濋氬父鎰忎负銆愰渶瑕侊紱蹇呰锛涢渶瑕佺墿锛屽繀闇鍝併戯紝鈥滀笉鍙暟鍚嶈瘝鈥濋氬父...
