[规则动词]需要某事，或被迫做某事:I need a break. The radio needs new batteries. You don't need to come if you don't want to.
[情态动词(只用于疑问句和否定句)]不得不:Need they wait? I needn't have bothered.
[名词]需要,必要:There's no need to shout!
语法结构
1 need(动词) | + 名词短语
Do you need anything from the shops?
Cathy needed an electrician so she phoned Jeff.
表示你所需要的东西
2 need (动词 ) | + 带to的不定式
We need to do something about the design.
Wendy won't need to retake her exam after all.
表示需要或不需要的东西
3 need (动词) | + 名词短语 | + 带to的不定式
She needs somebody to look after the baby for an hour or two.
I need a cloth to clean up this mess.
表示需要某人或某物来帮你做某事
4 need (动词) | + -ing
The grass needs cutting.
Does this salad need washing?
强调应该做某事
5 need (情态动词) | + -n't/not | + 不带to的不定式
You needn't dry the dishes:just leave them to drain.
I needn't have got up so early: I could've stayed in bed.
You needn't start the course next year:you can wait until the year after.
表示现在(或过去或将来)不需要的东西
6 there | + is/was等 | + 限定词 | + need(名词) | + 带to的不定式
There was no need to phone the police,but they did.
There's an urgent need to protect the ozone layer.
表示(不)需要的行为.
搭配
最常见的接在"need + to"后面的不定式是:be,know,do,have,make和get.
You need to be careful.
What we need to know is the exact cost.
Did you need to do that?
经常跟need连用的副词是badly(=very much):
He badly needs a haircut.
Money is badly needed to help restore the temple.
固定短语
need a hand = require help需要帮忙
Do you need a hand with the packing?
be in need of =require需要
This house is in need of a coat of paint.
if need be = if necessary 如果需要(的话)
We can always order a pizza ,if need be.