新概念英语第一册-语法专项之现在完成时课件

现在完成时 The Present Perfect Tense now future past 现在完成时 强调已经发生,过去的动作对现在的影响。 Mars has already finished his homework. He can watch TV now. Mars hasn’t cleaned his room yet. His room is a mess. 强调已经发生,过去的动作对现在的影响。 I have just finished my homework. Mars has already finished his homework. 肯定句:主语 + have/has + 过去分词 + 其他. Mars _ already packed his suitcase. A. have B. has I haven’t cleaned my room. Mars hasn’t cleaned his room yet. 否定句:主语 + haven’t/hasn’t + 过去分词 + 其他. Mars _ washed his clothes. A. hasn’t B. doesn’t Have you finished your homework yet ? Yes , I have. Has he cleaned his room ? No , he hasn’t. 一般疑问句: Have/Has + 主语 + 过去分词 + 其他 ? 回答: Yes , 主语 + have / has. No , 主语 + haven’t / hasn’t. _ you watered the flower yet ? A. Have B. Do Have you had your dinner yet ? A. Yes , I have. B. Yes , I did. I have just finished my homework. Mars has already finished his homework. Mars hasn’t cleaned his room yet. Have you cleaned your room yet ? 时间标志词 肯定句 just 刚刚 already 已经 否,疑 yet(否:还) yet(疑:已经) Mars hasn’t cleaned his room _. A. already B. yet He _ reading the book already. A. have finished B. has finished C. finishes I haven't finished my homework _. A. yet B. already C. yesterday 1. She _ doing it yet. A. haven't started B. has started C. hasn't started 2. I _ home already. A. have left B. left C. has left 3.I have _ finished my homework. A. yet B. just C. now 练习题 规则动词的过去分词的构成规则与规则动词的过去式的构成规则相同。 【注意!过去分词并不是过去式】 四点变化规则: (1) 一般动词,在词尾直接加“-ed ”。 work-worked-worked visit-visited-visited (2) 以不发音的“e”结尾的动词,只在词尾加“d ”。 live-lived-lived (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 (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 (5) 特殊 have - had leave - left 动词 过去分词 规则变化 AAA型 即原形、过去式和过去分词三者都相同。(共9个) cost—cost—cost cut—cut—cut hit—hit—hit hurt—hurt—hurt let—let—let put—put—put read—read—read set-set-set shut-shut-shut ABB型 过去式、过去分词相同。 buy—bought—bought spend—spent— spent teach—taught—taught feel—felt— felt tell—told—told smell—smelt—smelt feed—fed—fed learn—learnt—learnt learn-learned-learned say—said—said win—won—won 不规则变化 ABC型 原形、过去式、过去分词都不相同。 begin—began—begun grow— grew—grown AAB型 过去式和原形相同。 beat—beat—beaten ABA型 过去分词和原形相同。 come—came—come run— ran—run 情态动词型 (除must) 只有原形和过去式,没有过去分词。(共4个) can—could 可以 may—might 可能 will—would 将要 shall—should 应该 must 既没有过去式也没有过去分词。 肯定句:主语 + have / has + 动词的过去分词. 否定句 : 主语 + haven't / hasn't + 动词的过去分词. 疑问句:Have / Has + 主语 + 动词的过去分词 ? 回答: Yes , 主语 + have / has. No , 主语 + haven’t / hasn’t. 现在完成时的基本句型: Thank you ! $$