【after】after当连词怎么用

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【答案】 after作连词使用时,连接两个从句.语法结构为“B happened after A happenen或”After
　　A happened,B happened.,它们含义一样,都是指“A事件首先发生”,一定要注意第二个结构中的“,.
　　I went to America after I left school.
　　After I left school,I went to America.我离开学校后,我去了美国.
　　He did military service after he went to university.(=He went to university first.)我上完大学后,我去参军了.
　　After he did military service,he went to university.(=He did military service first.)我参军完后,我去上了大学.
　　2.after用作连词,引导状语从句时通常用现在时表示将来的含义.如：
　　I'll telephone you after I arrive.(NOT...after I will arrive.)
　　我到达后将打电话给你.
　　3.after引导的从句,我们习惯用完成时态.一般用现在完成时（have+过去式）代替现在时,用过去完成时（had+过去式）代替过去时.
　　I‘ll telephone you after I've arrived我到了后打电话给你.
　　After I had left school,I went to America.我离开学校后,我去了美国.
　　【注】在状语从句中,用完成时态和用其他时态并没用很大区别,只是我们习惯用完成时态强调”某件事情在另外一件事情开始时已经完成”.
　　4.在正式用语中,我们也常用“after+V-ing结构.
　　After pleting this form,return it to the director's office.完成这份表格后,把它交到行政办公室.