1、兩者的區(qū)別如下： ①when是at or during the time that, 既指時(shí)間點(diǎn)，也可指一段時(shí)間； while是during the time that，只指一段時(shí)間，因此when引導(dǎo)的時(shí)間狀語從句中的動(dòng)詞可以是終止性動(dòng)詞，也可以是延續(xù)性動(dòng)詞，而while從句中的動(dòng)詞必須是延續(xù)性動(dòng)詞。

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2、 ②when 說明從句的動(dòng)作和主句的動(dòng)作可以是同時(shí)，也可以是先后發(fā)生；while 則強(qiáng)調(diào)主句的動(dòng)作在從句動(dòng)作的發(fā)生的過程中或主從句兩個(gè)動(dòng)作同時(shí)發(fā)生。

3、 ③由when引導(dǎo)的時(shí)間狀語從句，主句用過去進(jìn)行時(shí)，從句應(yīng)用一般過去時(shí)；如果從句和主句的動(dòng)作同時(shí)發(fā)生，兩句都用過去進(jìn)行時(shí)的時(shí)候，多用while引導(dǎo)，如： a. When the teacher came in, we were talking. 當(dāng)此句改變主從句的位置時(shí)，則為： While we were talking, the teacher came in. b. They were singing while we were dancing. ④when和while 還可作并列連詞。

4、when表示“在那時(shí)”；while表示“而，卻”，表對(duì)照關(guān)系。

5、如： a. The children were running to move the bag of rice when they heard the sound of a motor bike. 孩子們正要跑過去搬開那袋米，這時(shí)他們聽到了摩托車的聲音。

6、 b. He is strong while his brother is weak. 他長(zhǎng)得很結(jié)實(shí)，而他弟弟卻很瘦弱。

7、 when; while 當(dāng)……時(shí)候 while能用when代替; 但是when卻不一定能用while代替. while+從句, 動(dòng)作一定會(huì)延續(xù) when+延續(xù)性動(dòng)詞/瞬間動(dòng)詞; when he arrived when he died when,while強(qiáng)調(diào)動(dòng)作同時(shí)發(fā)生 過去進(jìn)行時(shí) : 在過去的某一點(diǎn)時(shí)間, 或者是過去某一動(dòng)作同時(shí)發(fā)生的另外一個(gè)動(dòng)作 瞬間動(dòng)詞(arrive)無進(jìn)行時(shí)態(tài) I am arriving 進(jìn)行時(shí)態(tài)表示將要 When he arrived,I was having dinner. 同時(shí)發(fā)生的兩個(gè)動(dòng)作, 均用過去進(jìn)行時(shí) When I was doing my homework,my mother was cooking. When my mother was doing the housework,my father was watching TV. 同時(shí)發(fā)生的兩個(gè)動(dòng)作 1.一個(gè)用一般過去時(shí), 另一個(gè)用過去進(jìn)行時(shí) 2.分工的情況, 均用過去進(jìn)行時(shí) When the plane arrived,...were waiting inside the main building while others were waiting on... While... ...were keeping guard at the door,two others opened the parcel. 表面上是分工, 兩個(gè)動(dòng)作同時(shí)發(fā)生, 不是同時(shí)開始同時(shí)結(jié)束, 延續(xù)時(shí)間不一致, 長(zhǎng)一點(diǎn)時(shí)間的動(dòng)作用進(jìn)行時(shí)態(tài), 短時(shí)間的動(dòng)作用過去時(shí). When someone knocked at the door,I was having dinner. when和while引導(dǎo)的時(shí)間狀語從句與這一時(shí)態(tài)連用。

8、所以區(qū)別when和while的用法成了這一單元的難點(diǎn)。

9、 （一）、when，while都有“當(dāng)……時(shí)候”的意思。

10、when既可表示某一點(diǎn)時(shí)間，也可以表示某一段時(shí)間 。

11、在when引導(dǎo)的時(shí)間狀語從句中，其謂語動(dòng)詞可以是延續(xù)性的，也可以是非延續(xù)性的，可與主句中的謂語動(dòng)詞同時(shí)發(fā)生，也可在其后發(fā)生。

12、 例如： I was just reading a book when she came into my room. 她走進(jìn)我房間時(shí)，我正在看書。

13、 2、Were you writing when the teacher came in? 老師進(jìn)來的時(shí)候，你在寫信嗎？ 3、When he was a child he was always trying out new ideas. 他小時(shí)候就常常試驗(yàn)一些新的設(shè)想。

14、 （二）、while只能表示某一段時(shí)間，不能表示某一點(diǎn)時(shí)間。

15、在while引導(dǎo)的時(shí)間狀語從句中，其謂語動(dòng)詞只能是延續(xù)性的，而且也只能與主句中的謂語動(dòng)詞同時(shí)發(fā)生或存在。

16、 例如： While Jim was mending his bike, Lin Tao came to see him. 正當(dāng)吉姆修自行車時(shí)，林濤來看他。

17、 2、You can’t do your homework while you’re watching TV. 你不能一邊看電視一邊做家庭作業(yè)。

18、 （三）、另外，when和while的區(qū)別還在于：while引導(dǎo)的時(shí)間狀語從句多用進(jìn)行時(shí)態(tài)，而when引導(dǎo)的時(shí)間狀語從句多用一般時(shí)態(tài)。

19、 例如： While they were talking , the bell rang. 正在他們談話的時(shí)候，上課鈴響了。

20、 2、I was doing my homework when my mother came back home yesterday evening. 昨天晚上媽媽回家的時(shí)候，我正在做家庭作業(yè)。

21、 when/while都可做并列連詞．前者表and at that time,(這時(shí)，突然)，后者表對(duì)比，可譯為”然而” I was going downstairs when the telephone rang. Lucy is in blue while Lily is in green. when后加瞬間動(dòng)詞 while后也可加持續(xù)性動(dòng)詞。

相信通過while和when的區(qū)別這篇文章能幫到你，在和好朋友分享的時(shí)候，也歡迎感興趣小伙伴們一起來探討。