人教版八年级下册Unit 9 Have you ever been to a museum? 现在完成时态 课件(共16张PPT)

(共16张PPT)
——现在完成时态
Present Perfect Tense
Grammar语法课
不同时间发生的动作，动词要用不同形式
名称 时间 动词形式
一般现在时 平时，经常
现在进行时 正在进行
一般将来时 即将，计划
一般过去时 过去(与现在无关) 1.v-ed（规则动词）
2.不规则动词
过去进行时 过去某一时间正在进行 was/were+v-ing
1.v原形 2. v三单
am/is/are+v-ing
1.will/shall+v原形
2.am/is/are going to +v原形
1.v-ed（规则动词）
2.不规则动词
was/were+v-ing
判断下列句子的时态
1.She works in a factory.
2.I was doing my homework at this time yesterday.
3.We are going to have a picnic this Sunday.
4.They held a sports meeting last week.
5.Are you helping your mother .
一般现在时
过去进行时
一般将来时
一般过去时
现在进行时
现在完成时
1.过去发生的动作对现在造成的影响或结果。
2.过去已经开始，持续到现在的动作或状态
had breakfast
I have just had my breakfast.
(现在我不饿)
I’m not hungry now
moved here
three years ago
I still live here
I have lived here for three years.
I have lived here since three years ago.
now
现在完成时：
助动词
否定
haven’t
hasn’t
疑问
Have you……
Has he……
构成: have / has + v 过去分词
I haven’t finished my homework.
Have you finished your homework
Yes, I have. / No, I haven’t.
I have finished my homework.
2、概念：(1)表示过去或已经完成的某一动作对现在 成的影响或结果。常与下列状语连用：already, just, yet, ever, never, before
（2）表示过去已经发生，持续到现在的动作或状态，可以和表示从过去某一时刻延续到现在（包括“现在”在内）的 一段时间的状语连用。
a.for和表示一段时间的词组连用。
如：for 3 years
b.since和表示过去某一时刻的词或词组连用。 如：since 1997, since two years ago,since last week
现在完成时：
“仍然，还 ” 用在疑问句和否定句中。
I haven’t read this book yet .
Have you had breakfast yet
already:
yet:
“已经”通常用于肯定句中。
I have already posted the letter.
有时，也用在疑问句中表示惊讶。
Have you eaten up all the food already
“从来不” 用在否定句中。
Is he famous I have never heard of him.
ever
never
“曾经”通常用于疑问句和肯定句中。
I have ever seen this film.
Have you ever been to the USA
“以前”用在完成时中，放在句尾。
Ｉhave never read this kind of books before.
just
before
“刚刚 ”用在陈述句中。
I have just bought a novel.
动词的过去分词形式
1.规则动词
2.不规则动词
finish--finished--finished
live--lived--lived
carry--carried--carried
stop—stopped--stopped
Eg.
go—went—gone
see---saw—seen
forget—forgot--forgotten
since and for
The woman has worked at this school for 2 years. ( since two years ago)
since 2 years ago
since 1998;
since she came to the school
for + 一段时间
since+点时间
用for和since填空。
______three hours
______three o’clock
______two days
______yesterday afternoon
______I came here
______last Sunday
_______a week
_______a long time
_______1997
______two weeks
_______three years ago
_______ last month
for
since
for
since
since
since
for
for
since
for
since
since
比较现在完成时和过去时的区别：
*现在完成时所表示的是过去的行动所早成
的现在的情况。
*一般过去时表示的是过去发生的事实。
现在完成时不能和确定的过去
时间状语连用，如：yesterday,
last year, in 1976，two days ago,
just now…
但可以和一些不确定的时间状语连用，也可和包括现在在内的时间状语连用，如：
already, yet, before, lately,recently, once, twice, ever, never…
1)She has already come.
2)I haven’t read it yet.
*go\come\leave\die等词语表示的动作是一时的，不能延续，不能与for、since等表示一段时间的词连用，如不能说：
He has gone for two months.(F)
但可以说：
He has been away for 2months.
1. 她成为一名护士已经三年了。
2. 我五年前就认识李雷了。
3. 那些相片我已经寄给他了。（post）
4. 我来到这个学校后，他就一直教我。
5. 我刚丢了我的历史书。
She has been a nurse for three years.
I have known Lilei since five years ago.
I have already posted the photos to him.
He has taught me since I came to the school.
I have just lost my history book.
Thank you
Bye-bye!