文档介绍：Simple Present Tense III
*一般现在时态的否定和疑问形式．
否定和疑问形式都要借助do/does.
I like my picture.
--- I don’t like my picture.
--- Do you like your picture?
---What do you like?
She likes purple.
--- She doesn’t like purple.
---Does she like purple?
--- What does she like?
The Present Perfect Tense.
:助动词have/has+动词的过去
分词,即:have/has done, 现在以动词
work为例子将现在完成时态的肯定
形式, 否定形式和疑问形式及简略答
语讲解一下.
肯定形式:
I /You have worked.
He/She/It has worked.
We/You/They have worked.
*否定形式:
I /You have not worked.
He/She/It has not worked.
We/You/They have not worked.
疑问形式及简略答语:
Have I /you worked?
Yes, you/I have.
No, you/I have not.
Has he/she/it worked?
Yes, he/she/it has.
No, he/she/it has not.
Have we/you /they worked?
Yes, you/we/they have.
No, you/we/they have not.
2. 基本用法:
A: 表示过去发生或已经完成的某一动作对现在造成影响或结果.
I have just washed my clothes.
* 洗衣服是过去发生的动作, 对现在造成的结果是 “衣服洗干净了” .
B:表示过去已经开始,持续到现在的动作或状态, 常和表示从过去某一时刻延续到现在包括 “现在” 在内的一段时间状语连用.
We have learned English for two years.
3. 现在完成时常和already, yet, sometime, always, never, ever, before, just等词连用, 也可以和包括现在在内的this morning, today, this week, this year等时间状语连用.
I have written 3 English e-mails today.
今天我已经写了三封英文电子邮件了.
I have painted six new pictures this week.
这周我已经画了六幅新画.
I have seen you before.
我以前见过你.
4. 现在完成时和一般过去时的区别:
现在完成时态表示过去发生的某一动作对现在造成的影响或结果, 强调的是现在的情况, 所以不能和表示过去的时间状语连用, 如:yesterday, last year, two days