英语必修三unit4[PPT课件白板课件思维导图知识点知识树复习资料]人教版高中英语

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Unit4 Words

1. in time: sooner or later; eventually 迟早；最后；终于I’ll see him in time.

总有一天我会遇见他。

in time (for sth/to do sth):not late 及时；不迟

She will be back in time to prepare dinner.

她来得及回来准备晚饭。

in/out of time: in/not in the correct time

合/不合节拍

The audience clapped in time to the music.

观众合着音乐的节拍拍手。

2.

be harmful to 对…有害

do harm to sb. = do sb. harm 伤害某人，对某人有害处

1) Pollution is especially harmful to animals.

2) Smoking will do you a lot of harm.

It does no harm (for sb.) to do…

It does no harn for you to open the window.

There is no harm in (sb.’s) doing sth.

There is no harm in (your) opening the window.

3.multiply (数目上)增加，增多；乘；（使）繁殖

1) Our problems have multiplied since last year.

2) 2 and 5 multiply to make 10.

3) 6 multiplied by 5is 30.

= Multiply 6 by 5to make 30.

4) The plants here multiply rapidly.

•4.prevent sb from (doing) sth=stop sb from doing sth"阻止...做...”在主动语态中from 可以省略，被动语态中不行。

•How to prevent/stop this (from) happening.•Its nationals may be prevented/stopped from leaving the country.

•keep sb from doing sth中的from无论在主动语态中还是在被动语态中都不能省略。“阻止...做...”,如果省略from,意思为"让某人一直做某事"

•He kept me from getting hurt.

•He kept me doing homework.

• 5.puzzle n. 谜；难题v. （使）迷惑；（使）为难

•It's puzzles me.

•feel/ be puzzled about sth. 对某事感到迷惑•puzzle over/ about sth.对某事苦苦思索

••这个字母使我迷惑不解。This letter puzzles me.•‚她对她的未来感到迷惑。She felt puzzled about her future.

•ƒ他昨晚冥思苦想一道数学题。He puzzled over/ about a math problem last night.

•puzzling adj. 使迷惑的puzzled adj. 迷惑的；困惑的

•6.break out vt.& vi.（战争、打斗等不愉快事件）突然发生，爆发; 突然发生，爆发; 向外砸开;也可以表示突然大声叫喊等。•The war broke out in 1937.

•A fire break out last night.

•She broke out, “That is too unfair!”•take place 表示“发生、举行、举办”，一般指非偶然性事件的“发生”，即这种事件的发生一定有某种原因或事先的安排。例如：

•The Olympic Games of 2008 took place in Beijing.

•happen作“发生、碰巧”解，常指具体事件的发生，特别指那些偶然的或未能预见的“发生”，一般用于偶然或突发性事件。例如：

• A storm happened across the river in another country.

•occur作“发生、想到、突然想起”解，其意义相当于happen。例如：

•What has occurred? (= What has happened?) •come about表示“发生、产生”，多指事情已经发生了，但还不知道为什么，常用于疑问句和否定句。例如：

•When Mother woke up, she didn't know what had come about.

1.What’s the meaning of the word “Astronomy ”?I. Warming up 行星the science of stars;

2. Do you know the following terms?

star, planet, the sun / moon / earth, solar system 太阳系

3. How many planets are in the solar system?

恒星