比較while, when, as

1）as, when 引導(dǎo)短暫性動(dòng)作的動(dòng)詞。

　　　 Just as / Just when / When I stopped my car, a man came up to me.

2）當(dāng)從句的動(dòng)作發(fā)生于主句動(dòng)作之前，只能用when 引導(dǎo)這個(gè)從句，不可用as 或 while。

　　　 When you have finished your work, you may have a rest.

3）從句表示"隨時(shí)間推移"連詞能用as，不用when 或while。

　　　 As the day went on, the weather got worse.　

　　　日子一天天過去，天氣越變?cè)綁摹?/p>

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