I came in when/while he was doing his homework.当他在做家庭作业时,我走了进来
While/When I was in the town,I saw him twice.(当)我在城里时,见过他两次
Strike while the iron is hot.趁热打铁。.
when还可译作这时while还可译作而
He was playing football outside when it began to rain.
他在外面踢足球,这时开始下起雨来。
He is tall while his elder brother is short.
他个子高,而他哥哥个子矮
2. because,since.和as
because引导的从句通常表示说话人认为听话人不知道的原因或理由,从句往往是整个主从复合句的重心。
He was annoyed because he missed the bus. 他感到为难是因为他没有赶上那班车
since和as表示原因时,往往表示人们显然已知的理由或原因;因此,侧重点是主句的内容,原因只作附带说明。在语气上,becausc最强,since次之(在意义上相当于汉语中的既然),as最弱
Since his method doesnt work,lets try yours. 既然他的方法不起作用,我们就试一试你的。
As she was in a bad mood,we left her alone. 由于她心情不好,我们不去打扰她了。
He is absent frorn school because he is ill. 因为他生病,所以他没来上课
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