need的用法

need在什么情况下后分别接do/to do/doing

一．用作实义动词
作为实义动词，need后面的宾语可以是名词、动名词、动词不定式或代词，这种情况下，need既可用于肯定句，也可用于否定句和疑问句，构成否定句和疑问句时要借助于助动词do或does.
1．need sth.
这是need最常见的用法之一，其后的宾语可以是名词，也可以是代词。如：
1). We need a great deal of money now. 我们需要和多钱。
2). They don’t it any more. 他们不再需要它了。
3). Does your father need any help? 你爸爸需要帮助吗?
2．need doing 与 need to be done
need后面可跟动名词作宾语，这种情况下应注意两点：
①.主动形式的动名词doing具有被动的含义；
②.该动名词可以改为其动词不定式的被动形式而句子的意义不变。例如：
4). The door needs painting.
= The door needs to be painted. 那扇门需要油漆一下。
5). Your car needs mending.
= Your car needs to be repaired. 你的车需要维修了。
3．need to do sth.
作为实义动词，need后面需要接带to的动词不定式,表示有义务或责任去做某事。如：
6). What do we need to take for the picnic? 野餐我们需要带些什么？
7). Will we need to show our passports? 我们需要出示护照吗？
8). You need to take good care of your mother. 你要好好照料你妈妈。
二．用作情态动词
作为情态动词的need具有情态动词的一般性质，要充分阐释作为情态动词的need的用法，务必首先说明白情态动词的特征。情态动词的主要特征：
①．没有人称和数的变化。不论主语是第几人称，不论主语是单数还是复数，情态都词都无形式变化；
②．不能单独充当谓语。情态动词必须与一个实义动词一起构成复合谓语，并且这个实意动词要始终是动词原形。
③．变为否定句时只需在情态动词之后加not。
④．变为疑问句时只需将情态动词提到主语的前面。
这是情态动词的共性，作为情态动词的need当然也具有这些共性。了解了这些还不够，还要掌握作为情态动词need的一个个性，就是它只能用于否定句和疑问句，或用于由if或whether引导的宾语从句中，一般不能用于肯定句。理解了这些之后，我们便可以如此区分need的词性了：只要need后面跟的是动词原形，它就是情态动词。这时，变否定，只需在其后加not；变为疑问句，只需把它移主语的前面。例如：
9). Need I type this letter again? 我需要重新录入将这封信吗？
10). There is enough time. You needn’t hurry. 有的是时间，你不必着急。
11). The president wondered whether he need send more soldiers. 总统不知道他是否要增兵。
12). ---Must I hand in my homework now? 现在我必须交作业吗？
---No, you needn’t. 不，你不必。

need [ni:d] vt. 需要; 必须 These shoes need to be repaired. 这些鞋需要修理。 aux.v. 必须 Need he go yesterday? 昨天他有去的必要吗? n. 需要, 需求 责任, 必要 There is no need of your anxiety. 你的焦虑是不必要的。 需要的东西 The hotel staff will supply all your needs. 饭店工作人员会向你们提供一切需用的东西。 贫穷; 困窘 We are collecting money for families in need. 我们正在为有困难的家庭募捐。

美国传统词典[英英]

need need AHD:[n¶d] n. A condition or situation in which something is required or wanted: crops in need of water; a need for affection. Something required or wanted; a requisite: »Those of us who led the charge for these women's issues \ shared a common vision in the needs of womenÆ(Olympia Snowe). Class Day Speech at John F. Kennedy School of Government (Harvard U.) June 3, 1997 19980723 000029cc Necessity; obligation: There is no need for you to go. A condition of poverty or misfortune: The family is in dire need. v. need·ed need·ing needs v. aux. To be under the necessity of or the obligation to: They need not come. v. tr. To have need of; require: The family needs money. lack v. intr. To be in need or want. To be necessary. 语源 Middle English nede from Old English n¶od, n¶d[distress, necessity] 用法 Depending on the sense, the verb need behaves sometimes like an auxiliary verb (such as can or may) and sometimes like a main verb (such as want or try). When used as a main verb, need agrees with its subject, takes to before the verb following it, and combines with do in questions, negations, and certain other constructions: He needs to go. Does he need to go so soon? He doesn't need to go. When used as an auxiliary verb, need does not agree with its subject, does not take to before the verb following it, and does not combine with do: He needn't go. Need he go so soon? The auxiliary forms of need are used primarily in present-tense questions, negations, and conditional clauses. Unlike can and may, auxiliary need has no form for the past tense like could and might. 注释 When need is used as the main verb, it can be followed by a present participle, as in The car needs washing, or by to be plus a past participle, as in The car needs to be washed. However, in some areas of the United States, especially western Pennsylvania and eastern Ohio, many speakers omit to be and use just the past participle form, as in The car needs washed. This use of need with past participles is slightly more common in the British Isles, being particularly prevalent in Scotland.

爱心词典

need n. 需要, 必需, 必需品, 要求, 贫困 n. 需要, 必需 缺乏; 穷困; 困难; 危急 相关资料 n. 1. 需要;必要;需求;要求[S][(+of/for)][+tov] We have no need to be afraid of them. 我们不必怕他们。 2. 必要之物;需求[P1] 3. 贫穷;困窘;危急[U] My neighbors helped me in my time of need. 我的邻居在我困难的日子帮了我忙。 vt. 1. 需要,有...必要[W][+tov][+ving][O2][O4][O7] The garden needs watering. 花园该浇水了。 I don't think you need to worry about this. 我认为你不必为这事担心。 They need our help. 他们需要我们帮助。 vi. 1. 生活穷困 v.aux. 1. (多用于疑问句和否定句)需要...

need 为情态动词时 根do 是表示 需要的时候 跟 todo 和doing