人教版九年級英語下冊《We're trying to save the earth!》SectionA PPT課件下載(第3課時)，共56頁。
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
現(xiàn)在進行時
現(xiàn)在進行時表示現(xiàn)在或現(xiàn)階段正在進行或發(fā)生的動作。
① 肯定句: 主語 + am/is/are +v-ing
② 否定句: 主語 + am/is/are + not +v-ing
③ 疑問句: Am/Is/Are + 主語 +v-ing
現(xiàn)在進行時的用法
1.表示說話時正在進行的，目前正在發(fā)生的動作。
常帶有表示目前時刻的時間狀語如：now, at the (very) moment, for the time being, at present, 及Look! Listen! ...
① Look! The big bird is flying away.
看，那只大鳥正在飛走。
② He is watching a movie now.
他現(xiàn)在正在看電影。
2.表示目前一段時間內(nèi)正在進行，但說話時可能沒有進行的動作。
Right now I am studying Chinese by distance learning.
我現(xiàn)在正通過遠程教育學(xué)習(xí)漢語。
3.與always, constantly, forever, all the time等副詞連用，表示動作反復(fù)或習(xí)慣。此時句子常含有說話者的強烈情感在內(nèi)。表達較強的“責(zé)備”或“表揚”之意。
① You are always changing your mind.
你總是主意不定。(太煩人了。)
② He is always helping others.
他總是幫助別人。(他真是個好人。)
4.對于come, go, leave, arrive, start等表示位置移動的動詞�？捎眠M行時態(tài)表將來。
① He is leaving on Wednesday.
他將于周三離開。
② Mary isn’t here at the moment. She is coming later.
瑪麗現(xiàn)在不在這兒，她一會兒來。
used to do & be used to doing
used to do sth. 表示過去常常做某事，而現(xiàn)在往往不做了，后接動詞原形
be used to doing sth. 表示習(xí)慣于做某事
I used to get up at six o’clock.
我以前六點鐘起床。
Joe is used to drinking a cup of coffee every morning.
喬習(xí)慣每天早晨喝一杯咖啡。
Translation.
1.她過去常常周末和朋友閑逛。
She used to hang out with friends on weekends.
2.他習(xí)慣于每天晚上睡得很晚。
He is used to staying up every night.
被動語態(tài)：Passive voice
定義：表示主語是動作的承受者，即行為動作的對象的一種語態(tài)。
結(jié)構(gòu)：be + 過去分詞
A new school was built last year.
Our classroom is cleaned every day.
①一般現(xiàn)在時的被動語態(tài)：am/is/are + v-ed
The first section of New College English is designed for speaking practice and is based on pictures and topics.
②一般過去時的被動語態(tài)：was/were+ v-ed
These computers were made in our own country last year.
③一般將來時的被動語態(tài)：will/shall+be+v-ed
Shall we be asked to attend the opening ceremony?
現(xiàn)在完成時: Present Perfect
定義：表示動作已經(jīng)完成, 但對現(xiàn)在造成影響；或者表示從過去某一時間開始一直延續(xù)到現(xiàn)在并還可能持續(xù)下去的動作。
標(biāo)志詞：already, yet, ever, never, since, for…
I haven’t finished my homework yet.
現(xiàn)在完成時 — 構(gòu)成
肯定句：主語 + have / has + v-ed + 其他
否定句：主語 + haven’t / hasn’t + v-ed + 其他
一般疑問句： Have / Has + 主語 + v-ed+ …?
肯定答語：Yes, 主格代詞 + have / has.
否定答語：No, 主格代詞 + haven’t / hasn’t.
情態(tài)動詞
情態(tài)動詞本身有一定的詞義， 表示說話人的情緒、態(tài)度或語氣， 但不能單獨作謂語， 只能與其他動詞構(gòu)成謂語。常見的有: can (could), may(might), must, need, shall (should), will (would)等。
情態(tài)動詞無人稱和數(shù)的變化，后接動詞原形。否定式是在情態(tài)動詞后面加not。個別情態(tài)動詞有過去式形式，可用來表達更加客氣、委婉的語氣。
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.
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