Unit 6-10 单元重点句式结构分析和语法讲解总结合集 2024-2025学年人教版英语八年级下册

句式与语法总结

 

Unit6

一、“形容词/副词+enough+to do sth.”结构 

教材原句 

Yu Gong said they could put it into the sea because it’s big enough to hold everything. 愚公说他们可以把它放进海里，因为海足够大，可以容纳所有东西。 

 

结构解析 

“形容词/副词+enough+to do sth.”意为“足够……可以做某事”。当动词不定式的逻辑主语与句子的主语不同时，用 for 引出逻辑主语。 

- 例句：The question is easy enough for him to answer. 这个问题足够简单，他能回答上来。 

 

拓展 

该结构的否定形式可与以下句式互换： 

1. too...to...： 

   - The little girl isn’t old enough to go to school. 

     = The little girl is too young to go to school. 

2. so...that...： 

   - The problem isn’t easy enough for him to work out. 

     = The problem is so difficult that he can’t work it out. 

 

 

二、What引导的感叹句 

教材原句 

What a long time you slept in the forest! 你们在森林里睡了这么长时间！ 

 

句式结构 

1. What + a/an + 形容词 + 可数名词单数（+主语+谓语）！ 

   - What an interesting story you tell us! 

2. What + 形容词 + 可数名词复数/不可数名词（+主语+谓语）！ 

 

对比：How引导的感叹句 

- How + 形容词 + a/an + 名词单数！ 

  - How old a building that is! 

- How + 形容词/副词（+主语+谓语）！ 

 

 

三、状语从句引导词（unless, as soon as, so...that...） 

 

1. unless 引导条件状语从句 

含义：除非；如果不 

规则：主句用将来时，从句用一般现在时（主将从现）。可与 if...not 互换。 

- 例句： 

  - You will miss the bus unless you hurry up. 

  - Unless you help us, we will be lost. = If you don’t help us, we will be lost. 

 

2. as soon as 引导时间状语从句 

含义：一……就…… 

规则：主句用将来时，从句用一般现在时。 

- 例句：The students became quiet as soon as the teacher came in. 

 

3. so...that... 引导结果状语从句 

含义：如此……以至于…… 

规则：so 修饰形容词/副词，that 后接从句。 

- 例句：Li Lei runs so fast that I can’t catch up with him. 

 

Unit7

 

 一、物体长、宽、高、深等的表达方法 

教材原句 

If we’re only talking about the parts from the Ming Dynasty, it’s about 8,850 kilometers long. 如果我们只谈论明长城的话，它长约 8,850 千米。 

 

句式结构 

1. 基数词 + 单位词 + 形容词 

   - The river is 50 meters wide. 

2. 基数词 + 单位词 + 名词（size/length/width/height/depth） 

   - The box is 2 meters in length. 

3. 基数词-单位词单数-形容词（作定语） 

   - a 10-meter-deep pool 

 

 二、倍数表达法 

教材原句 

This elephant weighs many times more than this panda. 这只大象比这只熊猫重好多倍。 

重点句型 

1. 倍数 + as + 原级 + as 

   - Asia is about four times as large as Europe. 

2. 倍数 + 比较级 + than 

   - This hall is five times bigger than our classroom. 

3. 倍数 + the + 名词（size/length/width等） + of 

   - This street is four times the length of that one. 

 

 三、比较结构 

教材原句 

China is almost as big as the US, and it is the biggest country in Asia. 中国几乎和美国一样大，它是亚洲最大的国家。 

1. 比较结构的转换 

more...than... ⇨ less...than... ⇨ not as/so...as... 

  - This story is more interesting than that one. 

    = That story is less interesting than this one. 

    = That story is not as interesting as this one. 

比较级 + than any other... ⇨ 最高级 

  - The Yangtze River is longer than any other river in China. 

= The Yangtze River is the longest river in China. 

 

2. 比较级的特殊用法 

比较级 + and + 比较级（越来越...） 

  - He works harder and harder. 

the + 比较级, the + 比较级（越...越...） 

  - The healthier you are, the happier you will be. 

 

3. 最高级的特殊用法 

one of the + 最高级 + 复数名词（最...之一） 

  - China is one of the oldest countries in the world. 

the + 序数词 + 最高级 + 单数名词（第几最...） 

  - The Yellow River is the second longest river in China. 

 

 

Unit8

句式 SENTENCES

 

一、see sb. doing sth. 与 see sb. do sth.

教材原句

Not long after that, I saw some cannibals trying to kill two men from a broken ship. 在那之后不久，我看到一些食人肉者正要设法杀掉来自一艘破船上的两个人。

句式结构

 

①see sb. doing sth. 意为 “看见某人正在做某事”，用现在分词作宾语补足语，表示看见动作正在进行。

②see sb. do sth. 意为 “看见某人做某事”，表示看见动作发生的全过程或经常看见某动作发生。

I saw him working in the garden yesterday when I passed by. 昨天经过时，我看见他正在花园里干活。（强调 “我” 看见他正在干活）

I saw him work in the garden yesterday. 昨天我看见他在花园里干活了。（强调 “我” 看见了他干活的全过程）

联想拓展 与 see 用法类似的动词还有 watch，notice，hear 等。

Last night when my father was reading a newspaper, he suddenly heard someone crying for help.