情态动词need的用法(高中).doc

如有侵权，请联系网站删除，仅供学习与交流情态动词need的用法(高中)【精品文档】第 2 页情态动词need的用法一、need作情态动词的用法：need用作情态动词，后接动词原形，且need无人称、数的变化（第三人称单数不加s），否定形式为neednt。need用作情态动词时常用于否定句和疑问句中。如：Need he bring his laptop tomorrow? 明天他必须带他的笔记本过来吗？You needn't worry about it because it's not your fault. 你不必担心，因为那不是你的错。She needn't arrive 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。如：- Must I leave? 我必须离开吗？- No, you needn't. 不，你不必离开。二、need作实义动词的用法：need用作实义动词时，有人称、数和时态的变化。构成疑问句和否定句要借助do/does/did。1. need + sth. 需要某物e.g. She needs some fruits to eat. 她需要些水果来吃。2. need to do sth. 需要做某事e.g. You don't need to have the bike repaired right away. 你不必马上去修车。3. need sb. to do sth 需要某人做某事e.g. 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。4. need doing = need to be done 需要（用主动形式表被动）e.g. The room needs cleaning = The room needs to be cleaned. 房间需要打扫了。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 sth. 没必要做某事e.g. 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 study so hard. 我没必要这么努力学习。 There's no need. 意为“没有必要”。2. in (great) need of （非常）需要e.g. 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e.g. 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的短语A friend in need is a friend indeed. 患难之交才是真朋友。