现在时四种时态混合.ppt

* * * * * * * * * * * * * * * * * * III. 现在完成时 1 表示反复发生的经历 He has hosted the show eight times. 他已经连续八次主持表演。 Billy Crystal has been in many films and television shows. 贝利克克里斯托已经出演过多部电影和电视剧。 We have been to the Great Wall many times. 我们已去过长城多次。 2 表示动作发生在过去，但对现在仍留下某种后果和影响。 He has paid his income tax. 他已经交了个人所得税。 Doctors have found that people who laugh a lot live longer! 医生们已经发现经常大笑的人长寿。 3 表示动作发生在过去但持续到现在。 My mother has been ill for three days. 我妈妈已经生病3天。 Most of us have studied English for 5 years. 我们大部分人已经学了5年英语了。 4 下列句型中常用现在完成时。 It is (has been) +一段时间＋ since +从句 This (that/ It ) is the first (second…) time that + 完成时 This (That/ It) is the best/ finest / most interesting….+that+完成时 It’s/ It has been 3 years since they got married. It’s the first time that I have been to the Great Wall. This is the most interesting film that I have seen. Notes: 在时间或条件状语从句中，现在完成时可以代替一般将来时。 If you have done the experiment, you’ll understand the theory better. 如果你做完试验，你会更好地理解这个理论的。 Don’t get off the bus until it has stopped. 车停稳之前，别忙着下车。 Notes: 注意区分一般过去时与现在完成时 时间上有差异：凡有具体的过去时间，均用过去时态，不能用完成上，如：ago, last year, just now, the other day 等。 结果上有差异：现在完成时强调的是对“现在”的影响和结果，动作到现在刚完成或还在继续；一般过去时强调的动作发生在过去，和现在没有关系。 IV. 现在完成进行时 表示从过去某一时间开始一直延续到现在的动作，这个动作可能刚刚结束，也可能还要继续下去。 Chinese have been making paper for more than 2000 years. 中国造纸的历史已有2000多年了。 Doctors have been researching that question for many years. 多年来，医生们一直在研究这个问题。 The children have bee watching TV all morning. 孩子们一上午一直在看电视。 高考链接 Although he has lived with us for years, he ______ us much impression. A hadn’t left B didn’t leave C doesn’t leave D hasn’t left In such dry weather, the flowers will have to be watered if they _______. A have survive B are to survive C would survive D will survive All morning as she waited for the medical report from the doctor, her nervousness_______