首先,动词不定式短语一般跟在一些表语形容词后作原因状语,比如,I am glad to meet you!I am sorry to…常见的形容词有(afraid,angry,careful,surprised,willing,likely,curious,easy,considerate等);现在分词短语作原因状语时,一般有逗号将其与句子的主要部分分开,最主要的是分词短语相当于一个原因状语从句.比如Being a student,he was naturally interested in museum.