--What should I do with this passage?--_(Find out)_ the main idea of each paragraph.
问题描述：
--What should I do with this passage?--_(Find out)_ the main idea of each paragraph.
AFinding BFound out CFind out DTo find out
老师说这句话是省略.省略了（you should）find out the main idea of each paragraph.
那么为什么这里可以用省略?要想构成有没有什么要求?
答
可以理解为祈使句.
所以用动词原型.