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　　一、Past perfect过去完成时

　　应用：1.过去完成时表示过去的事件之前发生的事件或存在的状态。

　　2.过去完成时和一般过去时用于同一个句子中表示过去的事情发生的顺序。

　　The police arrested the man who had broken into a jewelers.

　　When I arrived， she left.

　　When I arrived she had left.

　　Form：过去完成时的构成是：主语+had+动词过去分词。

　　I had met him before.

　　By + 过去时间点----过去完成时。

　　Before/after/until/when/引导时间状语。

　　Language awareness

　　二、to have /get something done

　　要别人为自己做某事：have/get something done 结构。

　　Form：形式

　　Tense have /get something done

　　Present simple I have get my hair cut.

　　Past simple I had get my hair cut.

　　Present continuous I’m having /getting my hair cut.

　　Past continuous I was having/getting my hair cut.

　　Present perfect I’ve had my hair cut.

　　Past perfect I had had/got my hair cut.

　　Will I will have /get my hair cut.

　　Must I must have /get my hair cut.

　　Be going to I’m going to have/get my hair cut.