人教版八年级英语下册《Have you read Treasure Island yet?》SectionA PPT教学课件(第3课时)，共33页。
Objectives
To learn the present perfect tense with“already”and“yet”.
To learn some new words: fiction, technology, French…
Grammar Focus
Have you read Little Women yet?
Yes, I have. /No, I haven’t.
Has Tina read Treasure Island yet?
Yes, she has. She thinks it’s fantastic.
Have you decided which book to write about yet?
Yes, I have. I’ve already finished reading it. It was really good.
现在完成时
用法：
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.
时间状语：already, yet, just, ever, never, before
构成：现在完成时是由“助动词have / has+ 动词的过去分词”构成的，规则动词的过去分词构成与过去式相同，不规则动词的过去分词则需逐个记忆。动词的过去式的变化和过去分词的变化并不完全相同。我们对它们作了一个大致的分类。
一、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加ed。如：
pick → picked → picked;
wish → wished → wished;
stay → stayed → stayed
2. 以不发音的e结尾的动词后面加d。如：
like → liked → liked;
hope → hoped → hoped;
phone → phoned → phoned
3. 以“辅音字母 + y”结尾的动词，变y为i，再加-ed。如：
study → studied → studied;
hurry → hurried → hurried;
reply → replied → replied
4. 词尾只有一个辅音字母的重读闭音节动词，要双写辅音字母，再加-ed。如：
stop → stopped → stopped;
clap → clapped → clapped
不规则变化：
5. 以不变应万变。如：
let → let → let;
put → put → put;
read → read → read
6. 若中间有双写e，则去掉一个e，单词末尾再加t。如：
feel → felt → felt;
keep → kept → kept;
sleep → slept → slept
7. 末尾的字母d变t。如：
lend → lent → lent;
build → built → built;
send → sent → sent
8. 变为以-ought或-aught结尾。如：
buy → bought → bought;
bring → brought → brought;
catch → caught → caught;
teach → taught → taught
句式
1. 肯定句：主语 + have / has + 过去分词 (+其他)
2. 否定句：主语 + have / has + not + 过去分词(+其他)
3. 一般疑问句：have/ has + 主语 + 过去分词(+其他)
4. 特殊疑问句：
1)特殊疑问词 (不是句子主语) + have / has + 主语+过去分词 (+其他)
2)特殊疑问词(是句子主语)+have / has+ 过去分词(+其他)
现在完成时--与already连用
already 意为“已经”，常用于肯定句中。一般置于助动词have/has之后，过去分词之前，但也可放在句末。
e.g. 我已经看过这部电影了。
I have already seen the film.
我已经解决了这个问题。
I have already solved this problem.
我已经做完家庭作业了。
I have finished my homework already.
yet，在现在完成时句型中常置于句末。
1) “已经”，常用在疑问句中。
e.g. 琳达已看过这本书了吗?
Has Linda read the book yet?
你完成家庭作业了吗？
Have you finished your homework yet?
2)“还，仍然”，常用于否定句和疑问句。
e.g. 他还未开始工作。
He has not begun to work yet.
现在完成时与一般过去时
同学们要注意现在完成时与一般过去时的区别。虽然这两个时态都和过去发生的事情有关，但是现在完成时强调这一动作与现在的关系，如对现在产生的结果、影响等，而一般过去时只表示过去的事实，不表示和现在的关系。如：
I went home at 10:00 yesterday.
I have got home now.
我昨天十点回家的。现在我已经到家了。
I have already finished my homework.
我已经写完家庭作业了。
I finished my homework an hour ago.
我一个小时之前写完了家庭作业。
Homework
Review the new words and expressions.
Make sentences using the present perfect tense with “already” and “yet”. (at least 10 sentences)
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关键词：Have you read Treasure Island yet? PPT课件免费下载，.PPTX格式；
