现在完成时 详解.pptVIP

现在完成时 Speaker :wps powerpoint 现在完成时的构成 have (has）+ 过去分词 不规则动词原型-过去式-过去分词形式： 1） AAA型(三种都一样) 如：cost cost cost cut cut cut  hurt hurt hurt shut shut shut  set set set 2）ABB型(过去式与过去分词相同) 如: bring-brought-brought  catch caught caught  lead led led 3） ABC型(三种都不一样) 如：begin-began-begun grow grew grown ring rang rung  break broke broken 4）ABA型(原形与过去分词相同) 如: come-came-come become became become  run ran run 写出下列动词的过去分词形式. wake ______ 2. teach ______ 3. sell ________ 4. see ________ 5. ride ______ 6. pay _____ 7. choose ______ 8. throw _____ 9. think _______ 10. eat _____ 11. drive ______ 12. catch ______ 13. bring ______ 14. break ______ 15. give _______ 16. get _________ 17. know _______ 18. open _______ 19. write _______ 20. forget ________ Woken taught Sold seen Ridden paid Chosen thrown Thought eaten Driven caught Brought broken Given gotten Known opened Written forgotten present(now) future past 现在完成时 ( present perfect tense) do my homework 现在完成时的主要用法 1.表示过去发生的某一动作对现在造成的影响或结果。它强调的是过去的动作同现在的联系.常用的时间状语有already, yet, ever, never, just, before等. -- It’s so dark. --Someone has turned off the light. (有人刚把灯关了,对现在造成的结果是:现在很黑) -- Are you free? --I have finished my homework. I am free (我已经完成了家庭作业,对现在造成的结果是很有空) 1. 现在完成时中标志词的用法区别 1.Already 肯定句: 句中(助后实前)/句末 “己经” 一般疑问句: 句末(表示惊讶的语气) “难道” Eg. I’ve already had breakfast. (更常见) = I’ve had breakfast already.(表示强调) Have you had breakfast already? 2. yet在现在完成时中的用法 否定句:句末 “还(没)” 疑问句: 句末 “己经” Eg. I haven’t had breakfast yet. Have you had breakfast yet? 注: 带already的肯定句变成否定句或疑问句时,将already要变成y