could not/never have done 不可能已经做了某事,表示对过去的否定推测 must have done
一定已做某事 may/might have done 或许已经做了某事 ought to/should have done 本来应该做某事(而实际上没做) ought not to/shouldn’t
have done 本不该做某事(而却做了) could have done本来能够做某事(而实际上没做) needn’t have done本来不必做某事(而实际上做了) Ⅳ.单元语法→识记·思考·运用 限制性与非限制性定语从句 用适当的关系副词填空 1.The new computer,________ he loves a lot,breaks down frequently. 2.The reason ________ he was late was ________ he had to send his grandma to hospital. 3.After the flooding,people were suffering in that area,________ urgently needed clean water,medicine and shelter to survive. 4.The woman remembered the day,________ she saw Nazis burying something near her home. 5.The soldiers moved the boxes to a mine,________ they wanted to hide them.
which why that who when where 【学法·点拨】 ❶限制性定语从句与先行词关系密切,不可以用逗号将其与主句隔开;而非限制性定语从句与先行词关系不十分密切,可用逗号将其与主句隔开。 ❷that 不可用于引导非限制性定语从句。
❸关系代词在限制性定语从句中作宾语时可以省去,非限制性定语从句的关系词均不可省。 [单 词 点 睛] 1.search n.& v.寻找,探究
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