1、高中英语知识点大全(130):used to/would/be used to1、used to/would/be used to(1)used to 表示“过去惯常”,但“现在不做了”,指过去的习惯或状态,to 为不定式符号,后跟动词原形。有两点须注意:否定式。used to do sth.的否定式有两种形式:used not (usednt)to do sth. didnt use to do sth.例如:He didnt use to (usednt to)like country music,but nowhe is getting interested.疑问式。used to do
2、 sth.的疑问式也有两种形式。其简短回答中的to通常不予省略,但动词原形常被省略。Did + sb.(主语)+ use to do sth.?Used + sb.(主语)+ to do sth.?Did he use to play basketball?Used he to play basketball?(2)would(可以)是will的过去式,也可表示习惯动作。would 用于过去将来时。过去将来时的基本形式是:would+动词原形,在英国英语中,主语是第一人称时,would可换做should,第二、三人称用would。I thought I would make lots of n
3、ew friends.我曾认为我会交上许多新朋友。would 表示过去习惯的动作。“would + 动词原形”表示过去的习惯动作,与used to 同义,但与used to 有别。Used to do表示过去经常发生的动作或存在的状态,同时隐含有“现在已经有所改变”的意思,而“would+do sth.”可以用来表示“过去经常发生”,但不表示“过去存在的状态”。She used to say“No pains,no gains”.她过去常说:“不劳而获”。(used to可以换为would)I used to live in the countryside. 我过去住在农村。(此句的used
4、to不可用would换用)(3)be used to具有双重含义:be used to是use sth.to do sth的被动形式,意为“被用来干某事”,to为不定式符号。例如:Rice may be used to make wine.be used to表示“习惯于,”be可以换为get或become,表示“开始、变得习惯于”,to 为介词,其后接名词、代词或动词作宾语。例如:Im used to English food.2、wasteIt is a waste of time/money to do sth. 干浪费时间(钱)Its a waste of time to fix this watch.3、watch over/Watch outwatch over意为“照看”,“保护”,“监视”。如:Will you watch over my clothes while I go shopping.Watch out(for sth.) 意为“注意”,“监视”,“当心”。如:The doctor told her to watch out for anything unusual.