语法知识考点基本会出现在英语考试以及练习题的任意题型当中，所以说学习好英语语法是非常重要的，下面是小编给大家带来的八年级英语必考语法知识点，希望能够帮助到大家!
情态动词 should和could
【运用】
Ⅰ. 根据汉语意思完成下列句子，每空一词。
1. 你应该帮妈妈做家务。
You ________ ________ your mother with housework.
2. 我能参加校篮球队的选拔活动吗?
________ I ________ ________ for the school basketball team?
3. 你不应该总拿自己和别人比较。
You ________ always ________ yourself with others.
4. 我不在时，能请你照顾一下我儿子吗?
________ ________ ________ take care of my son while I’m away?
5. —— 我头疼。我应该去看医生吗?
—— 是的，你应该去。
— I have a headache. ________ ________ ________ to see a doctor?
— Yes, you ________.
Ⅱ. 按要求改写下列句子，每空一词。
1. You should drink some ice water. (改为否定句)
You ________ drink ________ ice water.
2. Could I borrow your new bike? (作肯定回答)
________, you ________. But you can’t lend it to others.
3. You should take your temperature first. (改为一般疑问句)
________ I ________ my temperature first?
4. Could you please open the windows? (改为否定句)
Could you please ________ ________ the windows?
5. Jenny should see the doctor and get an X-ray. (对划线部分提问)
________ ________ Jenny ________?
【梳理】
should后接动词原形，其否定形式是should not，常缩写为shouldn’t。
含should的肯定句变为一般疑问句时，应将should提到句首，其肯定回答为“Yes, 主语+should”，否定回答为“No, 主语+shouldn’t”。
含should的句子常表示责任、义务或提出建议等。
Could you please …?意为“请你……好吗?”表示请求对方做某事，其肯定回答常用Yes, sure / Certainly / Of course等，否定回答常用Sorry, I can’t / Sorry, I’m afraid not / I have to …等。
Could you please …?的否定形式是在please后面加not。另外，Could I / we …?意为“我/我们可以……吗?”表示请求得到对方的允许，其肯定回答常用Yes, you can /Yes, sure等，否定回答常用Sorry / No, you can’t等。
【答案】
Ⅰ. 1. should help
2. Could; try out
3. shouldn’t; compare
4. Could you please
5. Should I go; should
Ⅱ. 1. shouldn’t; any
2. Yes; can
3. Should; take
4. not open
5. What should; do
动词不定式
【运用】
用所给动词的适当形式填空。
1. It took the workers ten months ________ (build) this bridge.
2. Peter offered ________(teach) them how to swim.
3. Did you hear Mom and Dad ________(go) out just now?
4. He studied hard ________(get) better grades in the final exams.
5. We should not let this kind of thing ________(happen) again.
6. The Internet makes it possible for many people _______(work) at home.
【梳理】
动词不定式由“to+动词原形”构成，在句中可作宾语、宾语补足语、状语和主语等。
动词不定式可在句中作动词d e c i d e , refuse, hope, offer等的宾语。
动词不定式可在句中作宾语补足语，这类动词有advise, invite, ask等;动词不定式作使役动词和感官动词的宾语补足语时，应省略to。
动词不定式可在句中作目的状语。
动词不定式可在句中作主语，常用it作形式主语，真正的主语(即动词不定式)放在句尾。
【答案】
1. to build
2. to teach
3. go
4. to get
5. happen
6. to work
让步、目的和时间状语从句
【运用】
将下列句子翻译成英语。
1. 尽管阳光灿烂，但天气不暖和。
2. 我会把钥匙给你，这样你就可以自己进去。
3. 孩子们跟着音乐跳舞直到音乐停止。
4. 直到离开学校，他们才意识到学习的重要。
【梳理】
让步状语从句常由although, though等词引导，一般情况下，although可以与though互换使用，但二者不能与but同时出现在一个句子中。
目的状语从句常由so that, in order that等短语引导。
时间状语从句常由until, when, while等词引导。until用在肯定句中，意为“直到……为止”，常与延续性动词连用;until用在否定句中，意为“直到……才……”，常与终止性动词连用。
【答案】
1. Although / Though the sun is shining, it isn’t warm.
2. I’ll give you the key so that you can get yourself in.
3. Children danced to the music until it stopped.
4. They didn’t realize the importance of study until they left school.
过去进行时
【运用】
Ⅰ. 单项选择。
( ) 1. — I called you this morning, but nobody answered.
— I ________ flowers in my garden at that time.
A. watered
B. was watering
C. water
D. am watering
( ) 2. My brother ________ the Indian film Dangal when I phoned him yesterday.
A. watches
B. has watched
C. is watching
D. was watching
( ) 3. — You look tired. What’s wrong with you?
— I stayed up last night. I ________ my speech from eight o’clock to midnight.
A. practiced
B. am practicing
C. was practicing
D. has practiced
Ⅱ. 按要求改写下列句子，每空一词。
1. He read a magazine last night. (用at this time last night改写句子)
He ________ ________ a magazine at this time last night.
2. Linda was sleeping when Susan arrived. (改为否定句)
Linda _______ _______ when Susan arrived.
3. They were playing basketball at 4:00 pm yesterday. (改为一般疑问句)
________ they ________ basketball at 4:00 pm yesterday?
4. She was making dinner when her sister was cleaning the room. (对划线部分提问)
________ ________ she ________ when her sister was cleaning the room?
【梳理】
过去进行时由“was / were + V-ing形式”构成，表示过去某个时刻或某一时间段正在进行的动作。
过去进行时常与表示过去某一特定时间的状语连用，如at that time, at this time yesterday, all night, from 8 to 10 this morning等，也可与when / while引导的时间状语从句连用。
【答案】
Ⅰ. 1–3 BDC
Ⅱ. 1. was reading
2. wasn’t sleeping
3. Were; playing
4. What was; doing