need do ----需要做某事 need 在这里是情态动词 need to do ---需要做某事 表示主动 need doing ---需要被做某事 表示被动 1 What need do you have I to serve for you? 你有什么需要我为你服务的吗? 2They need to do the same now. 他们现在又需要这么干了. It has many works to need doing. 有很多事情需要去做. 不懂的问我哦 need to do sth实义动词 need do sth. 没有这种用法， 有need doing，表被动 “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 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 需要做某事 need doing 是需要被做有被动的意思 如;I need to wash my clothes. My clothes need washing. need doing = need to be done I need to mend my bike. My bike needs mending. 一、need作情态动词的用法： need用作情态动词时表“必须必要”的意思,后直接跟动词原型,且need无人称、数的变化（第三人称单数不加s）,也没有非谓语形式（不定式、分词）. 注意: need用作情态动词时常用于否定句和疑问句中. 例：Need he bring his laptop tomorrow?明天他必须带他的笔记本过来吗? Come on,you needn't worry about it becuse it's not your fault.行啦,你不必担心的因为那不是你的错. She needn't have arrived so early,need she?她本不必到得这么早,不是吗? 注意: must引导的一般疑问句的否定回答必须使用needn't.例如： -Must I leave?我必须离开吗? -No,you needn't.不,你不必离开. 二、need作实意动词的用法： 1、need + something 需要某物 例：I need some fruits to eat.我需要些水果来吃. 2、need to do something 需要做某事 例：You don't need to have the bike repaired right away.你不必马上去修车. 3、need doing = need to be done 需要…… 例：The room needs cleaning = The room needs to be cleaned.房间需要打扫了. 4、need somebody to do something 需要某人做某事 例：I need someone to help me out of this problem.我需要找人来帮助我解决这个问题. 三、need作名词的用法： need用作名词时,既可以是可数名词,也可以是不可数名词.主要常用句型如下： 1、(There's) no need to do something 没必要做某事 例：There's no need to cover such a long distance.没必要走那么远的距离. There's no need for me to break the window because I have the key.我没必要打破窗户因为我有钥匙. No need to run since we're not pressed for time.不必跑啦,我们 又不赶时间. 也可以单独使用：There's no need.意思是“没有必要”. 2、in (great) need of （非常）需要 例：The rescue team is in great need of medicine.救援小组非常需要药品. 3、if need be 如果需要的话 例：If need be,I'm going to do you a favor.如果需要的话我会帮你的. 四、关于need的一些短语、俚语用法. 1、A friend in need is a friend indeed.患难之交才是真朋友. 1、作情态动词：通常用在疑问句、否定句中，或与条件句、whether, hardly, nobody等连用。如： Need he go so soon?他这么快就要走吗? He needn't go. 他不必走。 If she wants anything, she need only ask. 她想要什麽, 只需说一声就行。 He wondered whether they need go there. 他不知道他们是否需要去那里。 Nobody need be afraid of catching the disease. 谁都不用害怕能得这种病. 本文来源：https://www.wddqw.com/doc/608fadfc88eb172ded630b1c59eef8c75fbf95b0.html