All of us should take an active part in this activity,shouldn’t we?
我们都应该积极参加这次活动,不是吗?
They oughtn’t to go fishing in this river,ought / should they?
他们不该在这条河里钓鱼,是吗?
掌握完成式用法
should 与 ought to 完成式意义和用法相同,可以通用。should / ought to have done sth. 本来应该做某事但实际未做,表达一种遗憾的感情色彩。shouldn’t / oughtn’t to have done sth. 本来不应该做某事但实际已做了,也表达一种遗憾的感情色彩。 had better 没有完成式。
The meeting has already begun. You should have come here half an hour ago.
会议已经开始了,你本来应该半小时之前就到这儿。
She is very sad now. You oughtn’t to have told her the news.
她现在很难过,你本不该把这消息告诉她。
课内题例
At that time, he spent as much time as he can ____ the ancient status which would be sank in the river.
A. paint
B. to paint
C. painting
D. painted
变式1. We will do everything we could _____ the endangered animals.
A. to protect
B. protect
C. protected
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