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句型38

…until…."直到……時候";not…until…"直到……才……"

[例句]

You are to stay until/till your mother comes back. 你得等到你媽媽回來。

The meeting was put off until ten o'clock. 會議推遲到十點鐘。

The villagers didn't realize how serious the pollution was until all the fish died in the river.

→Not until all the fish died in the river did the villagers realize how serious the pollution was.(倒裝句)

等到湖里的魚全死光了，村民們才意識到污染是多么嚴重。

He didn't go to bed until his mother came back.

→It was not until his mother came back that he went to bed.(強調句)

Not until he failed in the exam did he realize that he had wasted much time playing computer games.

Not until his son came back from school did he go to bed.

句型39

as引導的非限制性定語從句

在as引導的非限制性定語從句中，連接代詞as在句子中可以作主語、賓語或表語等，可以指人或物。其在定語從句中的位置比較靈活，既可以在句子前 面，又可以在句子中間或句子末尾。常用的結構有：as we all know; as is well known to…; as is often the case; as is said/mentioned above; as has been said before; as I told you before; as is evident; as often happens; as can be seen; as is/was expected; as we expect; as I can remember等。

[注意1]as通常只指整個句子的內容，不表示部分內容。

[注意2]as引導的非限制性定語從句通常指"事先可以預料到的""料想到的"，表達"好"的方面。

[注意3]as引導限制性定語從句時，常構成the same…as…; such…as…; so/as …as…等結構。在從句中既可以指人、物，也可以指整個句子。

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