新概念英语现在完成时与一般过去时的区别课件.pptx

一般现在时现在进行时一般将来时一般过去时小学英语常用的四大时态I’ve already had lunch. (L83)I’ve already had my holiday this year. (L83)Have you just been to the cinema? (L85)Have your mechanics finished yet? (L87)How long have you lived here? (L89)I’ve been here since 1976. (L89)例句回味现在完成时 VS 一般过去时表示过去发生的动作对现在造成的影响或结果。The boy opened the door.The door is open now.pastnowThe boy has opened the door.表示过去发生的动作对现在造成的影响或结果。There were some words on the blackboard now.She wrote some letters on the blackborad.pastfuturenowShe has written some letters on the blackborad.现在完成时表示从过去某个时间开始，并持续到现在的动作、状态；或者过去发生的动作对现在造成的影响。现在完成时futurepastnow一般过去时一般过去时表示纯粹发生在过去的事情。She had lunch just now.pastnowShe is full now.She has had lunch.nowpast区别现在完成时一般过去时①定义表示过去发生的动作对现在产生的影响表示过去发生的动作或状态，对现在无影响②结构主语+have / has+过去分词主语+动词过去式+其他③例句I have already had lunch. 我已经吃过午饭了。(现在是饱的)I had lunch three hours ago.我三小时前吃过午饭。(现在是饿饱不清楚)④时间 状语模糊的过去时间：already, yet, just,since+时间点，for+一段时间，before, three times, have been to，have gone to...明确的过去时间：just now, yesterday，two days ago, last week, in 1998, the day before yesterday, this morning...区别现在完成时一般过去时⑤动词变 化形式1.规则变化（同过去式相同）1.规则变化I .词尾+ed e.g. play-playedI. 词尾+ed e.g. play-playedII. 以e结尾+d e.g. live-lived-livedII. 以e结尾+d e.g. live-livedIII. 辅音字母+y， 变y为i再+ed e.g. study-studied-studiedIII. 辅音字母+y，变y为i再+ed e.g. study-studiedIV. 辅元辅且重读，双写尾字母再+ed e.g. stop-stopped-stoppedIV. 辅元辅且重读， 双写尾字母再+ed e.g. stop-stopped区别现在完成时一般过去时⑤动词变 化形式⑵不规则变化⑵不规则变化I. AAA：原形过去式过去分词相同 e.g. read-read-readI . i→a e.g. sit-sat drink-drank ring-rangII. ABB： e.g. buy-bought-boughtll. o→e e.g. blow-blew grow-grew know- knewIII. ABC: e.g. eat-ate-eatenIII. i→o e.g. drive-drove rise-rose ride-rodeIV. ABA：e.g. become-became-becomeIV. 原形 e.g. cut-cut let-let put-put read-readV . AAB：e.g. beat-beat-beatenV. 其他 e.g. do-did go-went hide-hid is-was are-were have-had take-took lose-lost eat-ate speak-spoke break-broke see