- 所属频道：人教版九年级英语下册
- 更新时间：2024-03-18
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人教版九年级英语下册《We’re trying to save the earth!》SectionA PPT课件下载(第3课时)，共56页。
Objectives
To learn about Present progressive, Passive voice, Present perfect and Modal verbs.
Warming up
Have you ever taken part in an environment project?
What should you do to save the environment?
① turn off the lights when…
② use the paper bags…
③ walk to school…
Language points
现在进行时
现在进行时表示现在或现阶段正在进行或发生的动作。
① 肯定句: 主语 + am/is/are +v-ing
② 否定句: 主语 + am/is/are + not +v-ing
③ 疑问句: Am/Is/Are + 主语 +v-ing
现在进行时的用法
1.表示说话时正在进行的，目前正在发生的动作。
常带有表示目前时刻的时间状语如：now, at the (very) moment, for the time being, at present, 及Look! Listen! …
① Look! The big bird is flying away.
看，那只大鸟正在飞走。
② He is watching a movie now.
他现在正在看电影。
2.表示目前一段时间内正在进行，但说话时可能没有进行的动作。
Right now I am studying Chinese by distance learning.
我现在正通过远程教育学习汉语。
3.与always, constantly, forever, all the time等副词连用，表示动作反复或习惯。此时句子常含有说话者的强烈情感在内。表达较强的“责备”或“表扬”之意。
① You are always changing your mind.
你总是主意不定。(太烦人了。)
② He is always helping others.
他总是帮助别人。(他真是个好人。)
4.对于come, go, leave, arrive, start等表示位置移动的动词常可用进行时态表将来。
① He is leaving on Wednesday.
他将于周三离开。
② Mary isn’t here at the moment. She is coming later.
玛丽现在不在这儿，她一会儿来。
used to do & be used to doing
used to do sth. 表示过去常常做某事，而现在往往不做了，后接动词原形
be used to doing sth. 表示习惯于做某事
I used to get up at six o’clock.
我以前六点钟起床。
Joe is used to drinking a cup of coffee every morning.
乔习惯每天早晨喝一杯咖啡。
Translation.
1.她过去常常周末和朋友闲逛。
She used to hang out with friends on weekends.
2.他习惯于每天晚上睡得很晚。
He is used to staying up every night.
被动语态：Passive voice
定义：表示主语是动作的承受者，即行为动作的对象的一种语态。
结构：be + 过去分词
A new school was built last year.
Our classroom is cleaned every day.
①一般现在时的被动语态：am/is/are + v-ed
The first section of New College English is designed for speaking practice and is based on pictures and topics.
②一般过去时的被动语态：was/were+ v-ed
These computers were made in our own country last year.
③一般将来时的被动语态：will/shall+be+v-ed
Shall we be asked to attend the opening ceremony?
现在完成时: Present Perfect
定义：表示动作已经完成, 但对现在造成影响；或者表示从过去某一时间开始一直延续到现在并还可能持续下去的动作。
标志词：already, yet, ever, never, since, for…
I haven’t finished my homework yet.
现在完成时 — 构成
肯定句：主语 + have / has + v-ed + 其他
否定句：主语 + haven’t / hasn’t + v-ed + 其他
一般疑问句： Have / Has + 主语 + v-ed+ …?
肯定答语：Yes, 主格代词 + have / has.
否定答语：No, 主格代词 + haven’t / hasn’t.
情态动词
情态动词本身有一定的词义， 表示说话人的情绪、态度或语气， 但不能单独作谓语， 只能与其他动词构成谓语。常见的有: can (could), may(might), must, need, shall (should), will (would)等。
情态动词无人称和数的变化，后接动词原形。否定式是在情态动词后面加not。个别情态动词有过去式形式，可用来表达更加客气、委婉的语气。
Ken can climb up the trees like a koala.
Tracy could ride a bicycle when she was five years old.
You mustn’t play with fire. It is dangerous.
Homework
Review Present progressive, Passive voice, Present perfect, used to and Modal verbs.
Preview the new words and expressions
Preview Section B on page 101.
… … …
关键词：We’re trying to save the earth! PPT课件免费下载，.PPTX格式；
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