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Unit 1 This is me
八年级
外研2024版
上
重难点预习之时态基础知识
2025秋新外研版八年级上册英语Unit 1的关键语法是:现在完成时。在讲现在完成时之前我们先大致看一下英语中16种时态的形式如下:
时 态 一般 进行 完成 完成进行
过去 did was/were doing had done had been doing
现在 do/does am/is/are doing have/has done have/has been doing
将来 will do will be doing will have done will have been doing
过去将来 would do would be doing would have done would have been doing
现在完成时:
现在完成时的基本句式 句型 结构
肯定句 主语+have/has+过去分词+其他。
否定句 主语+ have/ has+ not+过去分词+其他。
一般疑问句及其回答 Have/ Has+主语+过去分词+其他
肯定回答:Yes,主语+ have/ has.
否定回答:No,主语+haven't/ hasn't.
have not常缩写为haven't
has not常缩写为hasn't
用法:
①表示在以前某个时间已经发生的行为或曾经做过的事情对目前有某种影响。常与just(刚刚)、already(已经)、yet(还，仍然)、 never(从未)、so far(到目前为止)等连用。
eg: My sister has seen this film, so she doesn't want to see it with me.
我妹妹已经看过这部电影了，所以她不想和我一起看。
②表示到目前为止已经完成的事情。
I have finished my homework.我已经完成了家庭作业。
重难点:
用法1动作发生在过去，对现在有影响.
难点和一般过去的区分
常见信号词:by now, up to now, so far, since, in/during/over the past/last days/weeks/years 等。
经典例题
1. Despite the previous rounds of talks, no agreement_________________(reach) so far by the two sides.
2. The reports went missing in 2012 and nobody_____________(see)them since.
has been reached
has seen
用法2:先行词。被最高级和序数词修饰的定语从句中，必须用完成时
难点和一般过去的区分
常见信号词:the first, the second, the best, the worst, 等。
经典例题
This is the first time that I __________(be) to China.
2. It is the most instructive lecture that I___________(attend) since I came to this school.
have been
have attended
过去分词变化:(背记不规则变化表)
规则动词的过去分词构成与过去式相同,不规则动词的变化需特殊记忆。
类别 原形一过去式一过去分词
规则动词 help-helped-helped decide--decided-decided
stop--stopped--stopped carry-carried-carried
不规则 动词 A-A-A read/ri:d/-read/red/-read/red/ cut--cut--cut
put--put-put
A-B-B think--thought--thought lose--lost--lost
make-made-made
A-B-C see-saw-seen take-took-taken
go-went-gone forget-forgot-forgotten
A-B-A run-ran-run come-came-come
yet、already与just在现在完成时中的用法辨析
yet 常用于否定句或疑问句句末。用于否定句中常译作“还，尚”,用于疑问句中常译作“已经”。 He hasn't finished the book yet.
他还没有看完那本书。
Have scientists discovered any life out there in space yet 科学家们已经在太空中发现生命了吗


already 常用在肯定句中,用于强调某事已经发生，或某种情形已经开始出现。 They have already known one already another.
他们已经互相认识了。

just 表示动作刚刚结束,常放在助动词与过去分词之间。 What you've just told me is very surprising.
你刚才告诉我的事很令人吃惊。
Thanks!
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https://www.21cnjy.com/help/help_extract.php/ 让教学更有效 英语学科
Unit 1 This is me 重难点预习之时态基础知识
2025秋新外研版八年级上册英语Unit 1的关键语法是:现在完成时。在讲现在完成时之前我们先大致看一下英语中16种时态的形式如下:
时 态 一般 进行 完成 完成进行
过去 did was/were doing had done had been doing
现在 do/does am/is/are doing have/has done have/has been doing
将来 will do will be doing will have done will have been doing
过去将来 would do would be doing would have done would have been doing
现在完成时:
现在完成时的基本句式
句型 结构
肯定句 主语+have/has+过去分词+其他。
否定句 主语+ have/ has+ not+过去分词+其他。
一般疑问句及其回答 Have/ Has+主语+过去分词+其他 肯定回答:Yes,主语+ have/ has. 否定回答:No,主语+haven't/ hasn't. have not常缩写为haven't has not常缩写为hasn't
用法:
①表示在以前某个时间已经发生的行为或曾经做过的事情对目前有某种影响。常与just(刚刚)、already(已经)、yet(还，仍然)、 never(从未)、so far(到目前为止)等连用。
eg: My sister has seen this film, so she doesn't want to see it with me.
我妹妹已经看过这部电影了，所以她不想和我一起看。
②表示到目前为止已经完成的事情。
I have finished my homework.我已经完成了家庭作业。
重难点:
用法1动作发生在过去，对现在有影响.
难点 和一般过去的区分
常见信号词:by now, up to now, so far, since, in/during/over the past/last days/weeks/years 等。
经典例题
1. Despite the previous rounds of talks, no agreement_________________(reach) so far by the two sides.
has been reached
2. The reports went missing in 2012 and nobody________________(see)them since.
has seen
用法2:先行词。被最高级和序数词修饰的定语从句中，必须用完成时
难点 和一般过去的区分
常见信号词:the first, the second, the best, the worst, 等。
经典例题
This is the first time that I __________(be) to China.
have been
It is the most instructive lecture that I___________(attend) since I came to this school.
have attended
过去分词变化:(背记不规则变化表)
规则动词的过去分词构成与过去式相同,不规则动词的变化需特殊记忆。
类别 原形一过去式一过去分词
规则动词 help-helped-helped decide--decided-decided stop--stopped--stopped carry-carried-carried
不规则 动词 A-A-A read/ri:d/-read/red/-read/red/ cut--cut--cut put--put-put
A-B-B think--thought--thought lose--lost--lost make-made-made
A-B-C see-saw-seen take-took-taken go-went-gone forget-forgot-forgotten
A-B-A run-ran-run come-came-come
yet、already与just在现在完成时中的用法辨析
yet 常用于否定句或疑问句句末。用于否定句中常译作“还，尚”,用于疑问句中常译作“已经”。 He hasn't finished the book yet. 他还没有看完那本书。 Have scientists discovered any life out there in space yet 科学家们已经在太空中发现生命了吗
already 常用在肯定句中,用于强调某事已经发生，或某种情形已经开始出现。 They have already known one already another. 他们已经互相认识了。
just 表示动作刚刚结束,常放在助动词与过去分词之间。 What you've just told me is very surprising. 你刚才告诉我的事很令人吃惊。
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