needn't和don't need的区别和用法 needn't 和don't need to有什么区别？
needn't\u548cdon't need\u7684\u533a\u522b\u548c\u7528\u6cd5\uff1fneed\u53ef\u4ee5\u4f5c\u4e3a\u60c5\u6001\u52a8\u8bcd\u548c\u5b9e\u4e49\u52a8\u8bcd.
\u6240\u8c13\u60c5\u6001\u52a8\u8bcd,\u5c31\u662f\u5982\u540ccan\u4e00\u6837\u7684,\u540e\u9762\u53ea\u80fd\u8ddf\u52a8\u8bcd\u539f\u5f62(DO STH).\u800c\u5b83\u7684\u5426\u5b9a\u5f62\u5f0f\u4e5f\u662f\u540ccan\u4e00\u6837,\u5728\u540e\u9762\u52a0not,\u4e5f\u5c31\u662fneedn't.
\u6240\u4ee5,needn't do sth\u662f\u6b63\u786e\u7684.
\u5b9e\u4e49\u52a8\u8bcd,\u5c31\u5982\u540cwant\u4e00\u6837,\u540e\u9762\u8ddf\u4e0d\u5b9a\u5f0fTO DO.\u5b83\u7684\u5426\u5b9a\u662f\u5728\u524d\u9762\u52a0\u4e0adon't,\u5982don't want to do\u6216don't need to do sth.
\u6240\u4ee5,\u5728\u641e\u4e0d\u6e05\u695a\u540e\u9762\u5e94\u8be5\u8ddf\u4ec0\u4e48\u7684\u65f6\u5019,\u5c31\u7528can\u548cwant\u6765\u66ff\u6362\u5b83,\u770b\u540e\u9762\u5e94\u8be5\u662f\u4ec0\u4e48\u5f62\u5f0f,\u8fd9\u6837\u5c31\u4e0d\u4f1a\u5f04\u9519\u4e86.
\u524d\u8005\u662f\u60c5\u6001\u52a8\u8bcd\u3002
\u540e\u8005\u662f\u5b9e\u4e49\u52a8\u8bcd\u3002
\u524d\u8005\u540e\u9762\u63a5\u52a8\u8bcd\u539f\u5f62\uff0c \u540e\u8005\u540e\u9762\u63a5\u52a8\u8bcd\u4e0d\u5b9a\u5f0f to do sth
needn't \u5728\u8fd9\u91cc\u662f\u60c5\u6001\u52a8\u8bcd\u7684\u7528\u6cd5\uff0c\u540e\u63a5\u52a8\u8bcd\u539f\u5f62\uff0c\u5c31\u50cfcan't.
don't need \u5728\u8fd9\u91cc\u4f5c\u4e3a\u4e00\u822c\u52a8\u8bcd\uff0c \u540e\u63a5\u4e0d\u5b9a\u5f0f\uff0cto do,
\u5c31\u50cfdon't want to ...
\u662f\u8fd9\u6837\u7684\uff0cneedn't do \u548c don't need to do \u4e24\u8005\u6709\u4e9b\u5dee\u522b\u3002
\u5c31\u50cfneedn't have done \u548c didn't need to do \u4e00\u6837\u3002
\u4ece\u7528\u6cd5\u4e0a\uff0c\u524d\u8005\u662f\u60c5\u6001\u52a8\u8bcd\uff0c\u540e\u8005\u662f\u5b9e\u4e49\u52a8\u8bcd\u3002
\u4ece\u610f\u4e49\u4e0a\uff0c\u524d\u8005\u6697\u793a\u5df2\u7ecf\u505a\u4e86,\u6709\u201c\u672c\u4e0d\u9700\u8981\u201d\u7684\u610f\u601d\uff0c\u540e\u8005\u6697\u793a\u8fd8\u6ca1\u6709\u505a\uff0c\u5c31\u662f\u7eaf\u7cb9\u5730\u201c\u4e0d\u9700\u8981\u201d\u3002
\u5982\uff1aYou needn't do the housework.(\u8bf4\u8bdd\u65f6\u4f60\u5df2\u7ecf\u505a\u4e86\u5bb6\u52a1)
You don't need to do the housework.(\u8bf4\u8bdd\u65f6\u4f60\u5c1a\u672a\u505a\u5bb6\u52a1
\u8fd9\u6837\u53ef\u4ee5\u4e48\uff1f
need可以作为情态动词和实义动词.
所谓情态动词,就是如同can一样的,后面只能跟动词原形(do sth).而它的否定形式也是同can一样,在后面加not,也就是needn't.
所以,needn't do sth是正确的.
实义动词,就如同want一样,后面跟不定式TO DO.它的否定是在前面加上don't,如don't want to do或don't need to do sth.
所以,在搞不清楚后面应该跟什么的时候,就用can和want来替换它,看后面应该是什么形式,这样就不会弄错了.
前者是情态动词.
后者是实义动词.
前者后面接动词原形,后者后面接动词不定式 to do sth
needn't 在这里是情态动词的用法,后接动词原形,就像can't.
don't need 在这里作为一般动词,后接不定式,to do,就像don't want to ...
参考https://www.zybang.com/question/d38cdbb406920dd9f1c11e122a45eb77.html
“need”既可以作情态动词，也可以作实义动词，但是它们的用法不同。
作为情态动词的“need”的用法与其他情态动词“can”，“may”，“must”的用法基本相同：在限定动词词组中总是位居第一，没有非限定形式，即没有不定式、-ing分词或-ed分词等形式；第三人称单数现在时没有词形变化；情态动词之间是相互排斥的，即在一个限定动词词组中只能有一个情态动词。下面是“need”作为情态动词的用法：
一、need表示“需要”或“必须”，通常用于否定句和疑问句。例如：
1．You needn't do it again．你不需要再做了。
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。
“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
另外，“need”后还可以直接跟名词。请看下面的例子：
1．We need to collect the parcel before we leave for England．去英国之前，我们需要收拾好行李。
2．We need to tell him the truth．我们需要告诉他真相。
3．My car needs repairing．我的汽车需要修理。
4．The flowers need watering．这些花需要浇水。
5．His leather shoes needs to be mended．他的皮鞋需要修补。
6．Her room needs cleaning．她的房间需要打扫。
7．It is aquestion that needs very careful consideraton．这是一个需要慎重考虑的问题
其实常考的考点是，区分这两个词的词性，如果need 后接的是动词原形，那他就是情态动词 ，如果跟的是to do sth ，那么 他就是 实意动词。在这里 don't need 是实意动词，Needn't 是情态动词
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