demand和require的区别和用法
一、两者在含义上的区分
1. 有时可互换。如:
They demand [require] my appearance. 他们要求我到场。
2. 两者的微小区分是:
demand 通常指坚持其应当有或必要的东西,示意要求者有权这样做,常有命令之意;require 通常指根据法律、规章、规定、惯例、环境等提出要求,其客观性较强。比拟:
The policeman demanded his name and address. 警察要他说出他的名字和地址。
We require warm clothing for the winter. 我们需要过冬的温和的衣服。
注:用于事物时,两者都表示“需要”,有时可换用,其区分仍旧是require 的客观性较强。如:
The letter demands [requires] an immediate answer. 这信要求马上答复。
The court requires the attendance of witnesses. 法庭要求证人出庭。
二、两者在构造上的区分require名词
1. 两者后都可接 that从句,但从句谓语通常用“should+动词原形”这样的虚拟语气形式。如:
He demands [requires] that I (should) leave at once. 他要求我立刻离开。
His wife demanded [required] that I should tell him everything. 他的妻子要求我把一切都告知他。
The boss required [demanded] that everyone (should) attend the meeting. 老板要求人人参与会议。(D22)
2. demand 后可接不定式,但不接动名词;而require表示“要求”时,其后既不接不定式也不接动名词。如:
She demanded to see the manager. 她要求见经理。
He demanded to be told everything. 他要求把一切都告知他。
留意:require 表示“需要”时,其后可接动名词(用主动表被动)或不定式(用被动形式表被动)。如:
The room requires cleaning [to be cleaned]. 房间需要清扫了。    The machine requires repairing [to be
repaired]. 这机器需要修理了。
3. demand 不接不定式的复合构造,但 require 后可接不定式的复合构造。如:
They required him to keep it a secret. 他们要求他对这事保密。
All the members are required to attend the meeting. 全部会员均要求出席会议。
注:demand 后不接不定式的复合构造,但 demand of 后可接不定式的复合构造。如:
他们要求她同他们一起去。
误:They demanded her to go with them.
正:They demanded of her to go with them.
比拟:They demanded that she should go with them.
4. 表示“向某人要求某物”,可用 demand sth of [from] sb。如:    He demanded too high a price of me. 他向我要价太高。
He demanded an apology from the boss. 他要求老板赔礼。
require 有时也这样用,但更多是其被动语态后接 of sb。如:
What do you require of me? 你要求我做什么?
I have done everything that was required of me. 一切要我做的事情我都已经做好了。

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