现在完成时就是指:过去发生或已经发生的动作对现在造成的影响或结果。其基本构成是:have/has+done;过去完成时是指:在过去某个特定时间点或动作之前就发生的行为,即过去的过去。其基本构...
13. 过去将来完成时:(would have done) 表示到过去将来某一时间已经完成的动作,并且对过去将来那一时间点产生影响。 例:I believed by the end of that year an advanced version of th...
If Hugh Miller, after toiling all day in quarry (采石场), had devoted his evenings to rest and recreation, he would never have become a famous geologist. 2. Sb would never have done sth (好事1) , never have done sth (好事2), if sb had done sth (坏...
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