時間狀語從句PPT課件

1、 Adverbial Clauses 掌握狀語從句的關(guān)鍵1.準確掌握每一個連詞的含義。2.注意主句和從句的時態(tài)呼應。(1) as , while , when Which do you choose?Im going to the post office._ you are there, can you buy me some stamps?AAs Bwhile CBecause DIf 連接詞類別作 用例 句asas 表示“當?shù)臅r候”，往往和 when/ while 通用，但它著重強調(diào)主句與從句的動作或事情同時或幾乎同時發(fā)生。1.She came up as I was cooking.（同

2、時）2.The runners started as the gun went off.（幾乎同時）whenwhen可以和延續(xù)性動詞連用，也可以和短暫性動詞連用；when從句的謂語動詞可以在主句謂語動作之前、之后或同時發(fā)生；while和as從句的謂語動作必須是和主句謂語動作同時發(fā)生。 1.When we were at school, we went to the library every day.（在一段時間內(nèi)）2.Sorry，I was out when you called me（call為短暫性動詞）對不起，你打電話時我剛好外出了。 3. When I got to the airp

3、ort，the guests had left（got to后發(fā)生）當我趕到飛機場時，客人們已經(jīng)離開了。 while從句動作和主句動作同時發(fā)生，且從句動作為延續(xù)性動詞時，(when，while，as都可使用)。 主句中的動作或事情是在從句中的動作或事情的進展過程中發(fā)生，從句中的動詞一般要用延續(xù)性動詞。1.When While As we were dancing，a stranger came in（dance為延續(xù)性動詞）。2.Please dont talk so loud while others are working. While ,when 在句中的不同含義:While I was

4、 walking down the street, I came across an old friend. ( while=_)While I really dont like art, I find his work impressive. ( while =_ )He likes pop music, while I am fond of folk music. Strike while iron is hot.1)They were walking down the street when they saw an accident.2) I had just got home when

5、 it began to rain.3) I was about to go swimming when our guide stopped me.4) Its cold when it snows. 1.As I left the house, I forgot the key.2. As I get older, I get more optimistic.3. He looked behind as he went.4. As the weather is so bad, we have to stay home.5. You can do it as you like.6. Old a

6、s he is, he is still energetic.Judge the meanings of “as”. Fill in the blanks with “when, while, as” 1_ you meet a word you dont know, consult the dictionary. 2.The students took notes _ they listened. 3._ the wind rose ,the noise increased. 4.She called _ I was out. 5.We must strike _ the iron is h

7、ot. 6._you have finished your work, you may have a rest. 7. I was just reading a book _ she came into my room. whenasAswhilewhileWhenwhen before用法1.We had sailed four days and four nights before we saw land.2. We hadnt run a mile before he felt tired.3. Please write it down before you forget it.4. B

8、efore I could get in a word, he had measured me. 注意：before從句中謂語不用否定式。Before they reached the station, the train had gone. 才還沒有/不到就 趁（還未）還沒來得及 含有before的句型結(jié)構(gòu)：1. It will be / was一段時間before“過多久才” It_(還要過兩年)he leaves the country. It _(過了很長一段時間) before he got to sleep again.2. It will be / was + not一段時間be

9、fore “不多久就” It wasnt two years before he left the country. It was not long before he came back. Since用法1.I have returned home four times since I came here.2. She has been working here (ever since) he left school. 常用句型：常用句型：It has been (is) + 時間段時間段 + since從句從句 “自從自從有多長時間了有多長時間了 ” 畢業(yè)已經(jīng)有六年時間了。 It has

10、been (is) six years since she graduated from the university. （2）引導時間狀語從句的連接詞除上述外還有： till, until, Dont get off the bus until it has stopped.He waited for his father until (till) it was twelve oclock. once, as soon as, directly, immediately, As soon as I have finished it , Ill give you a call.Once you

11、 show any fear, he will attack you. He made for the door directly he heard the knock. the moment, the minute ,the second 一就hardly / scarcely when, no sooner than表示“一就We had hardly got into the country when it began to rain. He had no sooner arrived than she started complaining. each time, every time, the first time, by the timeEach time he came to my city, he would call on me.The first time I came to Shanghai, I loved it very much.By the time the doctor arrived ,the man had come to. 連接詞：because, as, since, now that, for,e.g. He didnt come to school because he was ill.表示“直接”原因。c