大学英语：动词不定式：1)目的状语;2)结果状语

　　I came here to meet you. (目的)

　　He hurried to the rail station only to miss the train. (结果)

　　分词：1) 伴随状语;2)原因状语;3)条件状语 4)让步状语;5)时间状语

　　Walking along the street， he met his old friend. (时间)

　　Being very tired， my father didn’t go out with us. (原因)

　　Made by hand， the silk shirt is very expensive. (原因)

　　Seen from the space， the earth looks like a blue ball. (条件)

　　2.3 非谓语动词，状语从句和独立结构

　　1) Having done their homework， the children began to play. (分词作状语)

　　2) After having done their homework， the children began to play. (连词+分词)

　　3) After they had done their homework， the children began to play. (状语从句)

　　4) With homework done， the children began to play. (独立结构)