Question

7.The modern plane is not the machine _____ it was when firs

Answer 1

句子结构如下：

The modern plane is not the machine [ that it was ( when IT WAS first invented )].

1. 中括号表示的内容是个定语从句,其中含一个时间状语从句,用小括号表示.其中完全大写的单词是省略掉的.

2. 这个定语从句的先行词是 machine.因为定语从句的连词（that）等于先行词,同时还在句子中充当表语,所以可以表示如下：[ that it was THE MACHINE ( when IT WAS first invented ).]

3. what 不能引导定语从句.what引导的从句是名词性从句,即：主语从句,宾语从句,表语从句.

4. what 引导的名词从句有很多的内容.另作回答.

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