请帮忙讲解一下这个句子的语法和句型.
问题描述：
请帮忙讲解一下这个句子的语法和句型.
Looking at his watch,he saw it was one o'clock,but the clock strike thirteen times before it stopped.
答
Looking at his watch首先看到looking想到这是非谓语动词的用法（句中saw是谓语）,现在分词作状语,表伴随but the clock strike thirteen times before it stopped与上一句构成并列句,before it stopped作状语不会再...