what time是名词性短语还是副词性短语?what time is it?和what time did the man knocked the door?有没有语法错误?

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what time是名词性短语还是副词性短语?what time is it?和what time did the man knocked the door?有没有语法错误?

是名词性短语  第一句对  第二句把what  time  改为when  when是副词