Though he is a child，he knows a lot.可以改为Thoug being a child,he knows a lot.吗，我感觉不能，却说不出缘由。谢谢
Though he is a child，he knows a lot
以上句子可以省略为下面句子
Though a child, he knows a lot.=Though he is a child, he knows a lot
备注：though引导的让步状语从句，假如从句是主语+be+ a child, she knows a lot
【2】Though old, he is quite strong.=Though old, he is quite strong.
【3】Though surprised to see us, the professor gave us a warm welcome.
=Though surprised to see us,the professor gave us a warm welcome.
【4】Though beaten, we were not disgraced.=Though beten, we were not disgrance
