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．Offeredhelp，oneoftensaid“thankyou”．(＝Whenonewasofferedhelp，oneoftensaid“thankyou”．)过去分词短语作时间状语。2．Givenmoretime，hewouldfinishthejob.(＝Ifmoretimewasgiventohim,hewouldfinishthejob.)3．Seenfromthehill，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．Oncetasted，thedishishardtoforget.(＝Oncethedishistasted，itishardtoforget.)2．Ifheated，icecanbechangedintowater.(＝Ificeisheated，itcanbechangedintowater.)3．Thoughtoldmanytimes，hedidn'tunderstandit.(＝Thoughhehadbeentoldmanytimes，hedidn'tunderstandit.)
