从属连词1. 引导时间状语从句的连词

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　1. 引导时间状语从句的连词
　　这类连词主要有：
　　when:
　　Don’t get excited when you talk.  讲话时别激动。
　　When he got up he felt dizzy.  他站起身时感到头晕。
　　while:
　　We must strike while the iron is hot.  我们要趁热打铁。
　　While she ate she grew more restless.  她一边吃一边变得更加忐忑不安。
　　as:
　　As he spoke two men came up.  在他讲话时两个人走了进来。
　　He smiled as he passed.  他经过时笑了笑。
　　before:
　　Look before you leap.  三思而后行。
　　It will be five years before we meet again.  要五年后咱们才能再相见。
　　after:
　　I arrived after he had left.  在他走后我到了。
　　I’ll tell them after you have left.  你走后我在告诉他们。
　
　　until, till :
　　I’ll take no steps until you arrive.  你来之前我不会采取什么行动。
　　I propose waiting till the police get here.  我建议等警察来了再说。
　　since:
　　How long is it since you came to London?  你到伦敦有多久了？
　　It was years since I had seen her.  我有好多年没见到她了。
　　whenever:
　　I go and visit him whenever I’m in town.  我每次进城都去看他。
　　Whenever possible, they play outside.  一有机会他们就到外面玩耍。