as-when和while的區(qū)別PPT課件

1、2021/6/71When，as和while的區(qū)別 when/as是是at or during the time that, 既指時間點，既指時間點，也可指一段時間；也可指一段時間； while是是during the time that，只指一段時間。，只指一段時間。 when/as引導的時間狀語從句中的動詞可以是引導的時間狀語從句中的動詞可以是終止性終止性動詞動詞，也可以是，也可以是延續(xù)性動詞延續(xù)性動詞， 而而while從句中的動詞必須是從句中的動詞必須是延續(xù)性動詞延續(xù)性動詞。 Sorry, I was out when(as) you called me.He can write onl

2、y when(as/while) the baby is asleep2021/6/72 when 說明從句的動作和主句的動作可以是同時，說明從句的動作和主句的動作可以是同時，也可以是先后發(fā)生；也可以是先后發(fā)生； as,while 則是同時發(fā)生。則是同時發(fā)生。 When /While /As she was making a phone call，I was writing a letter.Strike the iron while it is hot. Tom was disappointed that most of the guests had left when he arrived

3、 in the party.2021/6/73when和和while 還可作連詞。還可作連詞。when表示表示“在那時在那時(突然突然)”常用句型常用句型be doing when be about to do when I was eating with my wife and children when we heard a loud noiseWhile可表示可表示“而，卻而，卻”，表對比。，表對比。He likes her while she likes him.as常表示常表示“隨著隨著”；“一邊一邊，一邊，一邊”As autumn approaches, it is getting

4、 colder.The little girls sang as they went.2021/6/745. as 還可以表示原因（還可以表示原因（because,for）I didnt visit U as I know you were not at home6.還可以用于倒裝結構中，表示盡管還可以用于倒裝結構中，表示盡管形、副詞形、副詞+as+主主+謂，主句謂，主句名詞名詞(前不加冠詞前不加冠詞)+as+主主+謂，主句謂，主句Young as he is, he knows a lot.Child as he is, he knows a lot.2021/6/751.（2007山東）山

5、東）_I really dont like art， I find his work impressive.A. As B. Since C. If D. While2. （2007四川）四川）Id like to study law at university_my cousin prefers geography.A. though B. as C. while D. For3. （2007重慶）重慶） _ ，his idea was accepted by all the people at the meeting.A. Strange as might it sound B. As i

6、t might sound strangeC. As strange it might sound D. Strange as it might soundDCD2021/6/764.（2006廣東）廣東）Jenny was very sad over the loss of the photos she had shot at Canada， _this was a memory she especially treasured.A. as B. if C. when D. Where5. （2006湖南）湖南）I had just stepped out of the bathroom and was busily drying myself with a towel _I heard the steps.A. while B. when C. since D. after6. （哪個不對）（哪個不對）-Im going to the post office.