he doesn't know where the post office isis 后怎么可以跟where啊?

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he doesn't know where the post office isis 后怎么可以跟where啊?

he doesn't know where the post office isis 后怎么可以跟where啊?
he doesn't know where the post office is
is 后怎么可以跟where啊?

he doesn't know where the post office isis 后怎么可以跟where啊?
"where"是副词,在这里做宾语从句中is的表语.宾语从句中,the post office 是主语,单数第三人称,系动词当然是is啦.
正常的陈述语序应该是He doesn't know the post office is where.(他不知道邮局在哪)

he doesn't know whereis the post office

know后面是宾语从句,要用陈述句语序,where is the post office变成陈述句以后就是where the post office(主语) is(谓语)