但是,如when引导的是一个名词从句,后面可跟将来时态或条件时态:
He said,When will the train get in?
他说:火车什么时候进站?相当于:
He asked when the train would get in.
他问火车什么时候进站。
C since从句
since从句后面常跟完成时态:
Theyve moved house twice since they got married./Since they gotmarried,theyve moved house twice.
他们结婚后已搬了两次家。
He said hed lived in a tent since his house burnt down.
他说自从他的房屋被烧毁后,他就一直住在帐篷里。
Its ages since I sailed/have sailed a boat.
我未驾驶帆船已有好多年了。
I havent sailed a boat since I left college.
自从我大学毕业后就没再驾驶帆船了。
D after从句
after从句之后常跟完成时态:
After/When he had rung off I remembered
等他把电话挂断了之后,我才想起
After/When youve finished with it,hang it up.
你用完了之后,请把它挂起来。
E hardly/scarcely when,no sooner than:
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