有一读者问： 《英语世界》中有一句：
(1)We saw that as being the key.
句中的that as being如何分析？
that as being the key是谓语动词saw的复合宾语。see...as...（将……看作是……）是一常见结构，再如：
(2)Some people saw the affair as a tragedy.
如对复合宾语that as being the key作内部分析的话，that用作宾语，as being the key则是宾语补足语。如还要对as being the key加以分析，则as是介词，being是动名词（用不用皆可），the key是being的表语。
