used to指的是过去的习惯性动作，目的在于与现在形成对照，如：I used to work hard，是说“我过去常常努力工作。暗含的意义是：我现在不努力工作了在表示过去的习惯性这一点上，与would的意义相同（只不过used to既可用于表示过去的习惯动作，又可用于表示过去的状态。would只能用于表示过去习惯性的动作）。从形态

上看used to是个情态动词，其中的to是不定式符号，后面跟动词原形。

例如：

I used to go fishing on Sundays．我过去常常在星期天去钓鱼。

People used to believe the earth was flat．过去人们认为地球是平的。

When I was a child，I used to like swimming． 我小时候，曾经很喜欢游泳。

I used to live in Beijing, but now I live in Xi’an.我过去住在北京，但现在住在西安。

2．used to的否定式为“didn't use to”或“used not（usedn't）to”，其疑问形式为“Did sb．use to…？”或“Used sb to…？”

例如：He didn't use to drink.（＝He used not to drink. ）他以前不习惯喝酒。

Did you use to be a teacher？（＝Used you to be a teacher？）你以前是教师吗？

3. 另外，要注意与be ／get used to的区别，be used to doing表示习惯于做某事。

He is used to getting up early. 他习惯于早起。

I used to work hard

Not any more

He doesn’t work hard any more.

I used to have longer hair.

I used to be thin.

I am not thin any more.

He isn’t thin any more.

He didn’t use to drink

I used to be a teacher.

你以前是教师吗? Did you use to be a teacher？

used to do something 过去常常做某事，但是现在不做了

not any more 不再做某事

Fish used to play computer games .

Fish doesn’t paly computer games any more.

Fish didn’t use to play computer games.

Lisa doesn’t suck her tumb any more.

Lisa used to suck her tumb.

She used to be quite fat.

She isn’t fat any more.

What need doing

What’s been done.

The roof needs fixing.

The tree needs cutting down.

The grass needs cutting.

The windows need cleaning.

The door needs replacing.

The roof needs painting.

The walls need painting.

The fence needs replacing.

The trash needs throwing away.

The roof has been fixed.

The tree has been cut down..

The windows have been cleaned.

The door has been replaced.

The walls have been painted.

The fence has been replaced.

The trash has been thrown away.

1. 本课主要讲的是用if和will来表达将来发生的事情。主句（表示条件）用将来时，从句（表示结果）用一般现在时。简称“主将从现”。

如：If you don’t go home now, your lunch will get cold.

He won’t(will not) be happy if you don’t do your homework.

2. 当然，If 后面也可以跟现在进行时。

如：We will take a taxi if it’s raining later.

3. 表示可能/假如…时，will 可以用may, might, can来代替。

如：If you have a ticket, you can come.

If I have time, I might go to Beijing tomorrow.

4. If后面可以跟祈使句。

如：Don’t eat chocolate all the time if you want to be healthy。

prefer...to ...（比起...更喜欢...）的用法

注意在这个短语中，to后用名词或动名词。

I prefer swimming to playing soccer. 比起踢足球我更喜欢游泳。

I prefer cats to dogs. 比起狗我更喜欢猫。

1cats or dogs

I prefer cats,because dogs aren’t as clean as cats.

2watching TV or going to the movies

I prefer watching TV,because I don’t like walking.

3travelling by bus or by train

I prefer travelling by train.because the train is faster than the bus.

4rainy days or snowy days

I prefer snowy days.because I can make a snowman.

5supermarkets or small shops

I prefer to go around supermarkets,because I can get everything in one place.

6a trip to the beach or to the city

I prefer trip to the beach .because I can swim in the sea.

7thrillers or comedies

I prefer comedies .because the comedies is very instresting.

8comic books or novels

I prefer comic books .because the comic books are very instresting.

use to使用详解