新概念英语第二册语法精粹第一章英语动词时态Tenses英语时态是英语语法中的第一首难关，攻下此难关是作文、阅读、口语之关键。汉语用不同词表达相应时态，而英语用同一词的不同变化形式表达时态。一、 英语各种时态构成表：以play为例： 一般时态 进行时态 完成时态 完成进行时态现在 play is has hasplays am playing have played have been playingare过去 played was had played had been playingwere playing将来 shall shall shall shallwill play will be playing will have played will have been playing过去 should should should should将来 would play would be playing would have played would have been playing二、一般
