Do you know the number of books ordered by the library.你知道图书馆定购了多少本书吗?(过去分词作定语) Barking dogs seldom bite. 爱叫的狗很少咬人。(现在分词作定语) He is a man whom we should all learn from. 他是一个大家都应学习的人。(定语从句作定语) ...