课
程
程
资
讯
讯
综
合
合
过去完成时
过去完成时表示在过去某个时间或动作以前已经发生的动作或情况，简单地说就是表示“过去的过去”。
过去完成时的谓语形式：had +过去分词。
When we got to the theatre， the play had already started.
He suddenly remembered that he hadn’t locked the door when he left.
By the end of that year we had trained more than 1，000 employees.
They had been married many years before a child was born to them.
No sooner had we left the school than it began to rain.（no sooner…than= as soon as 一……就……，no sooner开头的句子要倒装）
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