高二英语it用法公开课精品课件图文.ppt

.1.It is time ( about time ，high time ) that ... 该句型中that 后的从句应该用虚拟语气，值得注意的是① 常用过去时态表示虚拟．② 有时也用should + 动词原形，should 不能省，常译为＂是（正是）．．．的时侯．．．＂ 　　 It is time that children should go to bed. 　　 = It is time that children went to bed. 2. It is the first ( second ... ) time that sb has/have done sthIt was the first time that sb had done sth It is the first time I have been here. = This is the first time I have been here. 3. It is .... since ...。 该句型主要用作处理瞬间动词的完成时，又要和表示一段时间的时间状语连用的问题，主句中是时间作表语，其时态是现在时或完成时，since 引导的从句通常是一般过去时态，而且是瞬间动词。如果主句是一般过去时，从句则用过去完成时。 　　 It is ( has been ) 5 years since his father died. 4. It is ... when ...。 该句型中的 when 引导的是一个时间状语从句，主句中的 it 指时间，表语由具体的时间充当，常译为＂当．．．的时候，是．．．＂ 　　 It was 5 o’clock when he came here. 5. It be ... before ... 该句型主句中的 it 指时间， 主句中的时态常是将来一般时或过去时两种时态．主句中的表语多是long， not long ， 3 days ， 2 weeks 等表示时间段的词或短语，常译为“没过多久 才”。否定为“没多久。。。就” It was 3 days before he went to Beijing. It will be not long before he finishes his job. It be ...time that.. It be the 1st/2nd..time that It be ...since.. It be ...before.... It be ...when... Group work ---Fill in the blanks with correct form 四 易混的五种时间句型 It is high time that we ____________________(study) hard. It is about time that we ___________________(study) hard. It is the first time that I ______________(visit) your school. It was the last time that I _______________(help) you. It __________________ (be) two years since his father died. It is seven years since I___________(work) in the factory. It _________(be) half a year before we leave the school. It was long before he ______________(come)back. It is 6 p.m. ________she goes home from school every day. It is at 6 p.m.________she goes home from school every day. should study / studied should study/ studied have visited had helped is / has been worked will be came that or when ? when that Yesterday Once More Carpenters When I was young Id listen to the radio Waiting for my favorite songs When they played Id