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1、现在完成时的定义：1. 表示过去发生或已经完成的某一动作对现在造成的影响或结果e.g. Have you had your lunch yet?Yes, I have. Ive just had it. (现在我不饿了。)2. 表示动作或状态从过去某一时刻开始，一直延续到现在，而且可能还要继续下去。e.g. I havent seen her these days.Ive known Bob for three years.Ive been at this school for over two years.现在完成时的构成：主语+have/has +动词的过去分词.否定：have, has后
2、面加not 一般疑问句：have, has提到主语前用法要点：1.现在完成时往往同表示不确定的过去时间状语连用already(肯定句中)，yet(否定，疑问，句末)，just, before, recently, still, lately, never等:现在完成时常用短语 up to now /till now, so farUp to/till now hes read many story books. 至今他已读过好多故事书。Ive been to New York three times so far. 至今我已到纽约去过三次。has gone (to),has been (to)
3、,has been (in) 的区别。has gone to:表示某人已去了某地，而没有回来(去了没回)(不可与 for+一段时间 连用)has been to :表示去过某地(去过已回来)(不可与 for+一段时间 连用)has been in/at(in表示相对大一些的地点;at表示相对小一些的地点):表示一直呆在某地， 常与时间段搭配since+时间点=for+时间段since+一般过去时态的时间状语从句=since+时间点+ago动词过去式和过去分词的变化相同规则变化：1. 一般在动词词尾直接ed. 如：pick picked picked; wish wished wished; s
4、tay stayed stayedA-A-A: let let let; put put put; read read read, cutcutcutA-B-B: lend lent lent; build built built; send sent sent buy bought bought; bring brought brought; catch caught caught; teach taught taughtA-B-C: choosechosechosen dodiddone seesawseen drinkdrankdrunk gowentgone taketooktakenA-B-A: runranrun comecamecome