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. I’ve 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 haven’t seen her these days.
I’ve known Bob for three years.
I’ve 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后面加not
梦幻西游网名一般疑问句：have, has提到主语前
用法要点：
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 far
Up to/till now he's read many story books. 至今他已读过好多故事书。键盘按键错乱怎么恢复
大头儿子小头爸爸78I've 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),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)(不可及 for+一段时间 连用)
has been to :表示去过某地(去过已回来)(不可及 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， 常及时间段搭配
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; stay → stayed → stayed
A-A-A: let → let → let; put → put → put; read → read → read, cut→cut→cut
A-B-B: lend → lent → lent; build → built → built; send → sent → sent
buy → bought → bought; bring → brought → brought; catch → caught → caught;
teach → taught → taught
A-B-C: choose→chose→chosen do→did→done
see→saw→seen drink→drank→drunk目的成语
go→went→gone take→took→taken
A-B-A: run→ran→run come→came→come
历年考研英语真题
发布评论