need to和need doing的区别？

need有2种词性
1,情态动词 就是你说的need do
2,实意动词 就是need to do
这两个都可以用,都是正确的,所以在肯定句中看不出区别
一般做题是从否定句中看出来的
1,needn't do
2,doesn't/don't need to do
这两种都是正确的
以下是一些干扰选项,都是错误的
needn't to do
doesn't/don't need do
因为它们混淆了情态动词与实意动词
needn't 是把need 看作情态动词,后面就不能再用to了
而dosen't/don't则把need看作实意动词,而后面加do,又相互矛盾.
need to do ; need doing ; need do的区别：
need to 作情态动词，通常用于疑问句、否定句、条件句、 whether(if) 名词从句或含否定意义的句子中。如：
I do not see why we need discuss it further.
我看我们没有必要讨论下去了。
That's all settled. It needn't be talked about.
那已全部解决了，没有必要再说了。
He asked me whether he need attend the meeting?
他问我他是否有必要出席这次会议？

2. need 又是实义动词，各种变化和用法与普通实义动词相同。如：
They need a rest after a long walk.
长距离行走后他们需要休息一下。
I need you to work for me, young man!
小伙子，我需要你为工作。

3. need 接动名词主动形式，表示被动意义、这时动名词和主语之间有动宾关系， need doing 可转换为 need to be done 结构，意思相同。如：
My hair needs washing badly. (= My hair needs to be washed badly.)
我的头发非常需要洗一洗。
The garden needs watering. (=The garden needs to be watered.)
花园需要浇水。
　　

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