it is 是一般现在时态
后跟名词，形容词或副词
如
It is a book.
It is nice.
It has been 是现在完成时态
如
It has been dead for two hours.
标签：been,区别
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it is 是一般现在时态
后跟名词，形容词或副词
如
It is a book.
It is nice.
It has been 是现在完成时态
如
It has been dead for two hours.
标签：been,区别
