现在完成时语法课件2022-2023学年人教版英语八年级下册

现在完成时态 Present Perfect Tense present(now) future past Present Perfect Tense 现在完成时 主语 + have/ has + 过去分词(pp) 助动词,无意义 现在完成时的结构 I have already had breakfast. (我现在不饿了。) 主语 + have/ has + 过去分词(pp) 否定形式 haven’t ( have not )+过去分词 hasn’t ( has not ) +过去分词 疑问句 把助动词 have / has 放在句首 现在完成时的结构 注:主语若是第三人称单数助动词用 has You have planted all the trees. I have planted all the trees. He/she has planted all the trees. They have planted all the trees. ①.区别have 和 has的用法 主语若是第三人称单数助动词用 has ②.现在完成时的否定句 主语+have/has+not+过去分词 The concert has started already. 音乐会已经开始了. The concert hasn't/has not started yet. 音乐会还没有开始. They have gotten to London already. They haven't/have not gotten to London yet. ③.现在完成时的一般疑问句 Have/Has +主语+过去分词 ? eg : A:Has the concert started ? 音乐会开始了没? B:Yes,it has.是的开始了. B:No, it hasn't 不,还没有开始. A:Have you finished your homework? B:Yes, I have.是的我做完了. B:No, I haven't 不,我没做完. 1、regular verbs 规则变化 与动词过去式变化一致 (1)、一般动词,在词尾直接加“ ed ”。 work-worked-worked visit-visited-visited (2)、以“ e ”结尾的动词,只在词尾加“ d ”。 live-lived-lived like → liked → liked; hope → hoped → hoped; 过去分词变化规则 (3)、以“辅音字母 + y ”结尾的动词,将 “y” 变为 “i”, 再加“ ed ”。 study-studied-studied cry—cried-cried hurry → hurried → hurried; (4)、重读闭音节结尾,末尾只有一个辅音字母,先双写该辅音字母,再加“ ed ”。 stop-stopped-stopped drop-dropped-dropped shop-shopped-shopped plan-planned-planned 2、irregular verbs不规则变化(A-B-B) have—had—had spend —spent—spent make—made—made say—said—said find—found—found hear—heard—heard 3、不规则变化(A-B-C) take—took—taken speak —spoke—spoken sing—sang—sung drive—drove—driven be—was/were—been go—went—gone 4、不规则变化(A-A-A) cut—cut—cut put —put—put let—let—let read—read—read 5、不规则变化 (A-B-A) come – came –come become –becam–become 1) 表示到现在为止已经完成或刚刚完成的动作。 现在完成时的用法 2) 表示过去发生的动作,强调结果或对现在的影响。 Someone has broken the window. (窗户现在是坏的) I have already lost the key. (我现在没有钥匙) I haven’t read that book yet. (不了解书的内容) I have just cleaned my hands. (手是干净的) Now we have planted all the trees.(树种好了) He has just come back.(现在已经回来了) 1.We have already cleaned up our classro