"need"后加“do"还是"to do"? Need do 和 need to do 区别

need\u540e\u52a0to\u548c\u4e0d\u52a0to\u7684\u533a\u522b

need to do sth\u662f\u9700\u8981\u505a\u67d0\u4e8b\uff0c\u8fd9\u65f6need\u662f\u4e00\u4e2a\u5b9e\u610f\u52a8\u8bcd\uff0c\u5f53\u5b83\u53d8\u5426\u5b9a\u65f6\u8981\u52a0\u52a9\u52a8\u8bcd\u4ee5\u5426\u5b9a\uff1ado/does/did not need to do sth.
\u800c\u4e0d\u52a0to\u8fd9\u65f6\u5019need\u662f\u4e00\u4e2a\u60c5\u6001\u52a8\u8bcd\uff0c\u662f\u4e00\u4e2a\u52a9\u52a8\u8bcd\uff0c\u5c31\u53ef\u4ee5\u5728\u5176\u672c\u8eab\u52a0not\u5426\u5b9a\uff0c\u540e\u9762\u63a5\u52a8\u8bcd\u539f\u5f62\uff1aneed do sth/need not do sth\u3002
\u4e00\u4e2a\u662f\u5b9e\u610f\u52a8\u8bcd\uff0c\u4e00\u4e2a\u662f\u52a9\u52a8\u8bcd\u3002

need do sth \u4e2d\u7684need\u662f\u60c5\u6001\u52a8\u8bcd\uff0c\u540e\u9762\u8ddf\u52a8\u8bcd\u539f\u5f62\u3002need to do sth \u4e2d\u4e00\u822c\u662f\u5b9e\u610f\u52a8\u8bcd\u3002

need\u7684\u7528\u6cd5\u8bb2\u89e3\uff0c\u4f9b\u53c2\u8003\uff1a
\u4e00\u3001\u4f5c\u60c5\u6001\u52a8\u8bcd
1\u3001need\u4f5c\u60c5\u6001\u52a8\u8bcd\u65e0\u4eba\u79f0\u6216\u6570\u7684\u53d8\u5316\uff0c \u540e\u63a5\u52a8\u8bcd\u539f\u5f62\uff0c\u591a\u7528\u4e8e\u5426\u5b9a\u53e5\u548c\u7591\u95ee\u53e5\u4e2d\u3002\u5982\uff1aYou needn't worry.\u4f60\u4e0d\u5fc5\u62c5\u5fc3\u3002
2\u3001\u7531need\u5f15\u51fa\u7684\u4e00\u822c\u7591\u95ee\u53e5\uff0c\u80af\u5b9a\u56de\u7b54\u5e38\u7528must\u6216have to;\u5426\u5b9a\u7b54\u8bed\u5e38\u7528needn't. \u5982\uff1a\u2014Need I answer the question? \u6211\u9700\u8981\u56de\u7b54\u90a3\u4e2a\u95ee\u9898\u5417\uff1f\u2014Yes, you must. /Yes, you have to.\u662f\u7684\uff0c\u4f60\u5fc5\u987b\u56de\u7b54\u3002/\u662f\u7684\uff0c\u4f60\u5f97\u56de\u7b54\u3002/No, you needn't.\u4e0d\uff0c\u4e0d\u5fc5\u4e86\u3002
3\u3001\u7531must\u5f15\u51fa\u7684\u4e00\u822c\u7591\u95ee\u53e5\uff0c\u80af\u5b9a\u56de\u7b54\u7528must,\u5426\u5b9a\u7b54\u8bed\u7528needn't\u6216don't have to\u3002\u5982\uff1a\u2014Must I do the work now? \u6211\u5fc5\u987b\u73b0\u5728\u5e72\u8fd9\u4e2a\u6d3b\u5417\uff1f\u2014Yes, you must /have to.\u662f\u7684\uff0c\u4f60\u5fc5\u987b\u505a\u3002/No, you needn't /don't have to. \u4e0d\uff0c\u4f60\u73b0\u5728\u4e0d\u5fc5\u505a\u3002
\u4e8c\u3001\u4f5c\u884c\u4e3a\u52a8\u8bcd
need \u4f5c\u4e3a\u884c\u4e3a\u52a8\u8bcd\u6709\u4eba\u79f0\u548c\u6570\u7684\u53d8\u5316\uff0c \u540e\u9762\u53ef\u63a5\u540d\u8bcd\u3001\u4ee3\u8bcd\u3001\u52a8\u540d\u8bcd\u53ca\u5e26to \u7684\u52a8\u8bcd\u4e0d\u5b9a\u5f0f\uff1b\u53ef\u7528\u4e8e\u80af\u5b9a\u53e5\u3001\u7591\u95ee\u53e5\u548c\u5426\u5b9a\u53e5\u4e2d\uff0c\u5982\uff1a
She needs help\u3002\u5979\u9700\u8981\u5e2e\u52a9\u3002
I don't need to see the doctor\u3002\u6211\u4e0d\u9700\u8981\u770b\u75c5\u3002\u2014Do you need to go at once? \u4f60\u9700\u8981\u9a6c\u4e0a\u8d70\u5417\uff1f\u2014Yes, I do.\u662f\u7684\uff0c\u6211\u5f97\u9a6c\u4e0a\u53bb\u3002\u2014No, I don't.\u4e0d\uff0c\u4e0d\u7528\u9a6c\u4e0a\u8d70\u3002

当need为情态动词时,加do.

其他加to do

need+doing表示被动含义
These flowers need watering.
这些花需要浇水.

两者都可

加do的need是情态动词

加to do的是一般动词

do
need是情态动词，情态动词后跟原形，所以是do.

need to do something.

to do 绝对没错

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