现在完成时课件.ppt

现在完成时
The Present Perfect Tense
【精点分析】
一、现在完成时态的结构:
主语+ have / has + 动词过去分词
(注:过去分词规则变化方式同过去式,不规则变化见不规则动词表)
例:I have finished my homework.
He has found his pen.
二、现在完成时态的句式:(以动词see为例)
1、陈述句:
I / We / You / They have seen....
He / She / It has seen.....
2、一般问句及简略回答:
Have you / they seen....?
Yes, I /we / they have. No, I / we / they haven't.
Has he / she / it seen....?
Yes, he / she / it has. No, he / she / it hasn't.
3、否定句:
I / We / You / They haven't seen...;
He / She / It hasn't seen...
二、含义:
(一), yet, ever, never, just, before等.
1. already在现在完成时中的用法
肯定句: 句中(助后实前)/句末“己经”
一般疑问句: 句末(表示惊讶的语气) “难道”
Eg. I’ve already had breakfast. (更常见)
= I’ve had breakfast already.(表示强调)
Have you had breakfast already?
注: 带already的肯定句变成否定句或疑问句时,将already要变成yet放在句末.
Eg. I have already done my homework.
否定句:
一般疑问句:
I haven’t done my homework yet.
Have you done your homework yet?
注: 有already的句子在时态上并不都是现在完成时,判断时要看该词后是否有动词的过去分词.
Eg. She’s already eighty years old.
It was already very late.
2. yet在现在完成时中的用法
否定句:句末“还(没)”
疑问句: 句末“己经”
Eg. I haven’t had breakfast yet.
Have you had breakfast yet?
3. ever在现在完成时中的用法
肯定句/疑问句: 句中“曾经”
Eg. I’ve ever been to Beijing.
Have you ever been to Beijing?
4. never在现在完成时中的用法
否定句: 句中“从来没有”
Eg. I’ve never been to Beijing.