There is a man at the door wants to see you .
此句话有错误。看似一个there be 句型，但是整句话出现了两个动词，is 和wants.
There is a man是个完整的句子wants to see you如果要修饰a man ，应该用后置定于从句。
可以改成：
There is a man at the door who wants to see you.
"at the door"作状语，"who"引导从句作定语。
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