国产成人v爽在线免播放观看,日韩欧美色,久久99国产精品久久99软件,亚洲综合色网站,国产欧美日韩中文久久,色99在线,亚洲伦理一区二区

19.8 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(guò)去,天氣越變?cè)綁摹?















 學(xué)習(xí)啦--英語(yǔ)語(yǔ)法大全