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名词性从句

69.We are talking about if this plan should be carried out.

If 和whether都可以引导动词的宾语从句，如果从句做的是介词宾语，只能用whether引导。所以把if 改为whether。

70.I can not decide if to stay or not.

只有whether才能和不定式搭配使用。因此把if 改为whether。

71.My suggestion is we try for a second time.

表语从句的引导词如为that，一般不省略。因此在we前加上that。

72.What will the professor say is not known yet.

名词性从句的语序都是陈述句语序。因此应改为：What the professor will say is not known yet.

状语从句

73.I will go unless he invites me.

此句意为“除非他邀请我，否则我不去。”而unless相当于if not, 所以本句应改成：I won’t go unless he invites me。

74.Although he tried, but he still couldn’t keep up with the others.

although 和but 不能同时用在一句话中，去掉任何一个都可以。

75.I won’t stay until he comes back.

含有not…until的句子的谓语动词应是点动词，含有until的肯定句的动词应是延续性动词，此句有两种改法：I will stay until he comes back.或I won’t leave until he comes back.

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