before和after引導(dǎo)的時(shí)間狀語從句

1.before是主句動(dòng)作發(fā)生在從句的前面。注意before引導(dǎo)的從句不再用否定式的謂語，并且當(dāng)before引導(dǎo)的從句位于主句之后，有時(shí)譯成“就，才”。還要注意主句和從句之間的時(shí)間關(guān)系。當(dāng)主句用將來時(shí)，從句總是用現(xiàn)在時(shí);如果before引導(dǎo)的從句謂語用的是過去時(shí)，則主句動(dòng)詞多用過去完成時(shí)，這樣以便體現(xiàn)動(dòng)作發(fā)生的先后。

2.After表示主句動(dòng)作發(fā)生在從句動(dòng)作之后。主句和從句的動(dòng)作的時(shí)間關(guān)系正好與before引導(dǎo)的從句相反。It will be four days before they come back.他們要過四天才能回來。Einstein almost knocked me down before he saw me.愛因斯坦幾乎把我撞倒才看到我。My father had left for Canada just before the letter arrived.我父親恰好在信到之前去加拿大了。They had not been married four months before they were divorced.他們結(jié)婚還不到四個(gè)月就離婚了。After you think it over, please let me know what you decide.你仔細(xì)考慮過以后，告訴我你是怎樣決定的。After we had finished the work, we went home.完成工作之后，我們回家了。(從句用過去完成時(shí)，主句用一般過去時(shí))

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