.時(shí)間狀語： 比較while, when, as考試重點(diǎn)

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 goes warm.

4)while只能跟延續(xù)性動(dòng)詞，when既可跟延續(xù)性的又可跟不能延續(xù)性的動(dòng)詞，所以有時(shí)通用。

When I got home, my mother was cooking. While my mother was cooking, I got home.

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