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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