Two people looking thought books in a bookstore为何可以直接主语加doing
问题描述：
Two people looking thought books in a bookstore
为何可以直接主语加doing
答
因为这是一个从句，而不是整句。
答
Two people？
2 person吧？
答
这个looking是用来修饰Two people的,就是个定语从句,中间省略了that,Two people(that) looking thought books in a bookstore.