十一. 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.

　　十二. 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.

　　十三. 定语从句

　　76.An orphan is a child who’s parents are dead.

　　定语从句中表“…的”引导词只有whose，所以把who’s 改为whose。

　　77.This is the very thing which I lost yesterday.

　　如果先行词为物且前有the only, the last, the very修饰时，定语从句的引导词只能用that。

　　78.This is the car for that I paid a high price.

　　定语从句的先行词为物，而且引导词放在介词后时，只能用which.

　　79.She is one of the students who has passed the exam.

　　定语从句修饰one of 加上复数名词时，复数名词是定语从句的先行词，因此把 has 改为have。

　　80.This is the place where we visited last year.

　　定语从句的先行词用关系代词还是关系副词要看定语从句中缺不缺主语或宾语，如缺用关系代词，如不缺用关系副词。此句中visit为及物动词，后无宾语，因此把where 改为which或that。

　　81.I, who is your friend, can understand you.

　　定语从句的谓语动词应与其先行词保持一致，因此把is 改为am。

　　82.China is a developing country, that is known to all.

　　非限定性定语从句的引导词永远不会是that，因此把that 改为which 或as。