剑桥英语语法 8.8分
读书笔记 第44页
莫苏非
Unit 15. Past perfect(I had done) A.I/we/they/you/it had(=I'd etc.)gone/finish etc. The past perfect simple is had+past participle(gone/seen/finished etc.) This is the starting poinit of the story. Then, if we want to talk about things that happened before this time,we use the past perfect(had...): *When Sarah arried at the party, Paul had already gone home. B.Had done(past perfect)is the past of have done(present perfect).Compare: present perfect * Who is that woman? I've never seen her before. past perfect *I didn't know who she was.I'd never seen her before.(=before that time) C.Compare the past perfect(I had done) and past simple(I did): * Was Tom at the party when you arried? No,he had already gone home. but "Was Tom there when you arried?""Yes, but he went home soon afterwards."
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