現(xiàn)在完成時(shí)
指著眼于現(xiàn)在 強(qiáng)調(diào)過去的動作對現(xiàn)在造成影響
句型：This is the first/best/the only book that I have ever read.
It has been three years since I learnt English.
=it is three years since I leant English.
4過去完成時(shí)
是指過去的過去
Hardly /scarcely had I arrived at the station when the bus left.
No sooner had I arrived at the station than the bus left.
特例：hope,wish,expect,think,intend,mean,suppose用過去完成時(shí)表示"原本… had expected,had intended 表示本期盼,本打算
句型：No sooner than hardly/scarcely when
No sooner had he arrived at the station than the bus left