关于what引导同位语从句的问题

I had a pretty good idea what she was going to do。这句话对么?是不是同位语从句?
其次改成I had a pretty good idea that she was going to do what。这样行么?
I had a pretty good idea about what she was going to do?这又是什么句子?

这句话不对。what she was going to do (她打算做什么)是个疑问句和idea (想法,主意)意思上不能同位。如果把idea 改为 question ,就可以同位了。追答

第二个问题就更错了,what 疑问词又是连接词不能放在后面。

第三句话正确。what she was going to do 是介词 about 的宾语从句。而about ... 介词短语作定语,修饰 idea。

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