现在完成时的定义

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 en her the 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

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 far

Up to/till now he's read many story books. 至今他已读过好多故事

书。

I'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+

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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; nd → nt

→ nt

buy → bought → bought; bring → brought → brought; catch

→ caught → caught;

teach → taught → taught

A-B-C: choo→cho→chon do→did→done

e→saw→en drink→drank→drunk

go→went→gone take→took→taken

A-B-A: run→ran→run come→came→come

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