老师您好!

He has been able to tell us more about active volcanoes than any man alive.

本句中 more 我理解为是形容词“更多的”，而不是代词，做 tell 的宾补，而 about active volcanoes 介词短语做状语修饰more，这样理解是否正确？盼复！谢谢！

解答如下：

你的理解有误，这里more不是形容词，而是代词用法,意思“更多的事情”，不是作宾补，而是作直接宾语。about active colcanoes,是介词短语作后置定语，修饰代词more.

(1)是一个双宾语及物动词用法

tell +间接宾语+直接宾语：属于双宾语结构用法

tell sb sth=tell sth to sb

He told me a secret yesterday.

=He tell a secret to me yesterday.

(2)也是一个复合宾语及物动词

tell +宾语+宾语补足语：属于复合宾语结构用法

tell sb to do sth

The teacher told us to finish our homework on time.