Question

介词短语不可以当宾语，为啥介词可以引导宾语从句？

Answer 1

回答如下：
介词必须后跟宾语，其宾语可以是名词、代词、数词、宾语从句、疑问词+不定式、动名词等。宾语从句属于名词从句，名词从句包括主语从句、宾语从句、表语从句、同位语从句。英语介词短语不能作主语、宾语、谓语，但可以作表语、宾补、定语、状语。例如：
He works in the factory. (名词)
Bamboo can be used for making paper. (动名词)
I am interested in how to do the experiment. (疑问词+ 不定式)
I am against what he said. (宾语从句)
He is in the room.(表语)
I saw the key on the desk. (宾补)
The people in the village live a happy life.(定语)
There is a letter on the table.(状语)

Answer 2

你这是混淆理解了。一个是介宾短语整体不可以作宾语，一个是介词后面可以接宾语从句。没毛病，你都说介宾短语了，介词后面接宾语，这个宾语是宾语从句也没问题啊。