八上英语全册必考语法知识点超全汇总
一、核心时态贯穿全册的重中之重
1. 一般过去时
- 定义:表示过去某时间发生的动作或状态
- 基本结构:主语+动词过去式be动词用was/were
- 标志词:yesterday/last week/just now/in 2020/…ago等
- 动词过去式变化:
1. 规则变化:+edplayed/walked;辅音+y改y为i+edstudied
2. 不规则变化:go-went, eat-ate, see-saw, buy-bought需单独记忆高频词
- 例句:He watched TV last night.
- 定义:表示过去动作对现在的影响,或动作持续到现在
- 基本结构:主语+have/has+动词过去分词
- 标志词:already/yet/ever/never/for+时间段/since+时间点
- 意:for接“一段时间”for 3 years,since接“过去时间点”since 2021
- 例句:I have lived here for 5 years.
3. 过去进行时
- 定义:表示过去某一时刻正在进行的动作
- 基本结构:主语+was/were+动词-ing形式
- 标志词:at 8 o'clock last night/this time yesterday/when引导的时间状语从句
- 例句:She was reading a book when I called her.
二、情态动词高频考点,掌握3大核心词
1. can/could
- 用法:表“能力”或“请求许可”could比can更委婉
- 例句:
- He can swim fast.能力
- Could you help me?请求,回答用can
2. may/might
- 用法:表“许可”或“推测”might可能性更低
- 例句:
- You may go now.许可
- It might rain tomorrow.推测
3. must/have to
- 区别:must表“主观必须”,have to表“客观不得不”
- 例句:
- You must follow the rules.主观
- I have to leave now客观,如赶火车.
三、形容词/副词的比较级和最高级单选、写作高频
1. 基本变化规则
- 单音节词:+er比较级/+est最高级tall-taller-tallest
- 双音节词:部分+er/estclever-cleverer,部分+more/mostuseful-more useful
- 多音节词:+more/mostbeautiful-more beautiful
- 不规则变化:good-better-best, bad-worse-worst, many-more-most
2. 常用句型
- 比较级:A+be动词+比较级+than+BTom is taller than Jim.
- 最高级:A+be动词+the+最高级+in/of范围She is the tallest in our class.
四、宾语从句语法填空、写作必考点
1. 三要素
- 引导词: - 句用that可省略:I think (that) he is right. - 一般疑问句用if/whether:Do you know if he will come? - 特殊疑问句用what/when/where等:Could you tell me where the park is?
- 语序:必须用语序主语在前,谓语在后 ✘:I don't know what is he doing. ✔:I don't know what he is doing.
- 时态: - 主句是现在时,从句任意时态; - 主句是过去时,从句用过去相关时态一般过去时/过去进行时/过去成时
- 肯定式:动词原形Open the door.
- 否定式:Don't+动词原形Don't run in the hall.
- 提示:句首用please表礼貌Please pass me the pen.
2. 感叹句
- What:What+a/an+形容词+名词! What a beautiful day! / What cute dogs!
- How:How+形容词/副词! How fast he runs! / How happy I am!
- 基本结构:to+动词原形否定式:not to do
- 常见用法: 1. 作主语:To learn English is important.常用It作形式主语:It is important to learn English. 2. 作宾语:I want to go to the park.接to do的动词:want/hope/decide/try等 3. 作宾补:He asked me to help him. 4. 作目的状语:She came here to see me. 八上英语语法核心集中在时态过去时/成时/过去进行时、情态动词、比较级、宾语从句四大模块,需结合例句记忆规则,尤其意动词过去式/分词变化、宾语从句语序、比较级标志词。通过专项练习如时态填空、从句改写巩固,避免死记硬背,做到“理+应用”结合。
六、动词不定式to do结构,用法多样
五、祈使句与感叹句简单但易出错
1. 祈使句
2. 现在成时
