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新外研版初中英语八年级上册 Unit 4 Digital life 知识清单
一、核心词汇 (Key Words)
computer (电脑) smartphone/mobile phone (智能手机) tablet (平板电脑)
laptop (笔记本电脑) screen (屏幕) keyboard (键盘)
mouse (鼠标) Internet (互联网) WiFi (无线网络)
app/application (应用程序) search (for sth) (搜索) download (下载)
upload (上传) chat (with sb) (聊天) post (发布)
share (分享) shop online/go shopping online (网上购物) play online games (玩网络游戏)
watch videos online (看在线视频) send/receive an email (发送/接收邮件) useful (有用的)
convenient (方便的) fast (快的) popular (流行的)
dangerous (危险的) harmful (有害的) addicted (上瘾的)
online (在线的) offline (离线的)
二、重点短语及句型 (Key Phrases & Sentence Patterns)
1. 谈论使用频率与习惯
How often do you... (你多久...一次？)
How often do you use the Internet
I always/often/sometimes/seldom/never... (我总是/经常/有时/很少/从不...)
I often search for information online.
spend time (in) doing sth / on sth (花时间做某事/在某事上)
I spend two hours (in) doing my homework every day.
It takes (sb) some time to do sth (做某事花费（某人）一些时间)
It takes me half an hour to check my emails every morning.
2. 讨论优缺点 (Advantages & Disadvantages)
The advantage/benefit of... is that... (...的优点是...)
The benefit of online learning is that it is very convenient.
The disadvantage/problem with... is that... (...的缺点是...)
A problem with spending too much time online is that it’s bad for your eyes.
On the one hand, ... On the other hand, ... (一方面...，另一方面...)
It’s good for/bad for... (这对...有好/坏处)
Reading e-books is good for saving trees.
3. 表达观点与建议
In my opinion/view, ... (依我看...)
I think/believe (that)... (我认为/相信...)
We should/shouldn’t... (我们应该/不应该...)
We should be careful about what we post online.
It’s important (not) to do sth. (（不）做某事很重要。)
It‘s important to protect your personal information online.
Remember (not) to do sth. (记得（不要）做某事。)
三、语法知识 (Grammar Focus)
1. 现在完成时 (Present Perfect Tense) —— 初步引入
功能：表示过去发生的动作对现在造成的影响或结果，或表示从过去开始持续到现在的动作或状态。本单元主要学习其完成性用法（表示已经做过或从未做过某事）。
结构：主语 + have/has + 动词过去分词 (V-ed/pp) + 其他.
肯定句：I have finished my homework.
否定句：He has not (hasn’t) seen the film.
疑问句：Have you ever been to Beijing Yes, I have. / No, I haven’t.
标志词：already (已经), yet (还/已经，用于否定/疑问), ever (曾经), never (从不), just (刚刚)。
She has already posted the photos.
I have never chatted with strangers online.
Have you ever played this game yet
动词过去分词 (Past Participle) 的变化：
规则变化：与过去式相同，加ed。如：play → played, use → used。
不规则变化：需单独记忆。本单元可能涉及：see → seen, have → had, be → been, go → gone。
2. 动名词作主语 (Gerund as Subject)
功能：将动作名词化，作为句子的主语。
结构：V-ing + 谓语动词 (单数) + 其他。
Playing computer games for too long is harmful to your eyes.
Learning English online is very popular now.
Chatting with friends makes me happy.
与不定式作主语的比较：
动名词作主语通常表示一般性、习惯性的活动。
不定式作主语常表示具体的、一次性的或将来的动作。
3. 副词及其用法 (Adverbs)
用于修饰动词，表达动作的频率、方式等。
频率副词：always, usually, often, sometimes, seldom, never (常位于be动词、助动词之后，实义动词之前)。
He is always late. / He always gets up early.
方式副词：carefully, quickly, slowly, well (常位于句末)。
Use the computer carefully.
四、交际用语 (Communicative Expressions)
1. 谈论网络体验
What do you usually do online (你通常在网上做什么？)
Have you ever tried... (你尝试过...吗？)
What’s your favourite website/app (你最喜欢的网站/应用是什么？)
2. 安全提醒与建议
Keep your password safe. (保护好你的密码。)
Don’t share too much personal information. (不要分享太多个人信息。)
Be nice to others online. (在网上要对他人友善。)
3. 表达同意与反对
I agree (with you). (我同意你的看法。)
I don’t think so. (我不这么认为。)
That’s true, but... (没错，但是...)
五、易错点提示
1. 现在完成时与一般过去时的区别：
现在完成时：强调动作对现在的影响或结果，不与具体的过去时间连用。
I have seen the film. (我知道电影内容了。)
一般过去时：只说明动作发生在过去，常与具体的过去时间连用。
I saw the film last week. (我上周看了这部电影。)
2. “spend” 与 “take” 表示“花费”的区别：
spend：人作主语，结构：sb spend(s) time/money (in) doing sth / on sth。
I spend an hour (in) reading every day.
take：事/物作主语，结构：It takes sb time to do sth。
It takes me an hour to read every day.
3. 动名词作主语时，谓语动词用单数：
正确：Watching TV is relaxing.
错误：Watching TV are relaxing.
4. “how often” 对频率提问，回答用频度副词或 “once/twice a week”：
How often do you go online Every day. / Three times a week.

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