The bell (indicating)the end of the period rang and we hard to stop our discussion括号中为什么加“ing”?
问题描述：
The bell (indicating)the end of the period rang and we hard to stop our discussion括号中为什么加“ing”?
答
这是现在分词indicating引起的现在分词短语,做the bell的后置定语,相当于一个定语从句 the bell that indicated the end of the period.不用定语从句,就用定语部分的主要动词的-ing形式来代替,这就是现在分词短语作后置定语.make such rapid progress为什么make后面不加“a”?