初中英语现在完成时课件(共62张PPT)

现在完成时 The Present Perfect Tense 现在完成时的基本结构 have/has+动词过去分词 （has用于第三人称单数） 过去分词的变化： (1)规则变化 构成规则 原 形 过 去 式 过去分词 一般在动词原形末尾 加-ed work play worked played worked played 结尾是e的动词加-d hope live hoped lived hoped lived 末尾只有一个辅音字 母的重读闭音节词，先 双写这个辅音字母，再 加-ed stop trip stopped tripped stopped tripped 结尾是“辅音字母+y”的动词，先变“y”为“ i”再加-ed study worry studied worried studied worried 不规则动词的过去式以及过去分词 巧记规律 AAA: put– put –put let—let –let ABA: become—became—become ABB: stand—stood—stood ABC: eat— ate—eaten AAA cost-cost-cost read-read-read put-put-put cut-cut-cut let-let-let set-set-set hit-hit-hit hurt-hurt-hurt 原形、过去式和过去分词的词形和读音都相同的单词，结尾字母一般是t或d。 特殊：动词read的过去式和过去分词虽然词形与原形一致，read-read-read，但发音分别是[ri:d]-[red]-[red]。 有些动词的过去分词与原形是一样的: run-ran-run come-came-come become-became-become overcome-overcame-overcome ABA ABB(含规则动词) 原型 过去式 过去分词 例词 -eep -ep