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英语·选修8(人教版)第四学时Grammar语法精讲过去分词作状语一、过去分词作状语语法精讲过去分词作状语可表示时间、结果、原因、条件、让步、伴随等，表被动意义，相当于一个状语从句。1．Offered_help，oneoftensaid“thankyou”．(＝Whenonewasofferedhelp，oneoftensaid“thankyou”．)过去分词短语作时间状语。2．Given_more_time，hewouldfinishthejob.(＝Ifmoretimewasgiventohim,hewouldfinishthejob.)3．Seen_from_the_hill，thetownlooksbeautiful.(＝Ifthetownisseenfromthehill，itlooksbeautiful.)语法精讲第2、3句中的过去分词短语相当于条件状语。4．Hecamebackatmidnight，tired_and_badly_wounded．(＝Hecamebackatmidnightandhewastiredandbadlywounded.)过去分词短语相当于伴随状语。二、连词＋分词(短语)语法精讲为了使分词短语与主句关系更清楚，可在分词前加连词，常用的连词有：once，when，while，if，though，although，after，before，as等。1．Once_tasted，thedishishardtoforget.(＝Oncethedishistasted，itishardtoforget.)2．If_heated，icecanbechangedintowater.(＝Ificeisheated，itcanbechangedintowater.)3．Though_told_many_times，hedidn'tunderstandit.(＝Thoughhehadbeentoldmanytimes，hedidn'tunderstandit.)