语法是初中英语里比较难的，同时也是中考英语必考的一部分，下面总结了初三英语语法知识点，供大家参考。
1.在后面加s。如：fathers, books, Americans, Germans, apples, bananas
2.x, sh, ch, s, tch后加es。如：boxes, glasses, dresses, watches, wishes, faxes
3.（1）以辅音字母加y结尾的变y为i再加es 如：baby-babies, family-families, duty-duties, comedy- comedies, documentary-documentaries, story-stories
（2）以元音字母加y结尾的直接加s。如：day-days, boy-boys, toy-toys, key-keys, ways
4.以o结尾加s(外来词)。如：radios, photos, 但如是辅音加o的加es：如: tomatoes西红柿, potatoes马铃薯
5.以f或fe结尾的变f为v再加es(s)。如：knife-knives, wife-wives, half-halves, shelf-shelves, leaf-leaves, yourself-yourselves
6.单复数相同(不变的)有：fish, sheep, deer鹿子, Chinese, Japanese
7.一般只有复数，没有单数的有：people,pants, shorts, shoes, glasses, gloves, clothes, socks
8.单词形式不变，既可以是单数也可以是复数的有：police警察局，警察, class班，同学, family家，家庭成员
9.合成的复数一般只加主要名词，多数为后一个单词。如：action movie-action movies, pen pal-pen pals; 但如果是由man或woman所组成的合成词的复数则同时为复数。如：man doctor-men doctors, woman teacher-women teachers
动名词相当于名词,在句子中可以做主语、宾语、表语、定语等。
1. 作主语
Fighting broke out between the South and the North.
南方与北方开战了。
2. 作宾语
Would you mind turning down your radio a little, please?
请问你介意调小一点收音机的音量吗?
3. 作表语
Babysister’s job is washing,cooking and taking care of the children.
保姆的工作是洗衣服,作饭和照看孩子。
1.如前句是否定式从句,则主句用neither,而不用nor.
If you don't do it,neither should I.如果你不干,我也不干.
2.如后连续有几个否定句式,则用nor,不用neither.
He can't sing,nor dance,nor skate.
1.主语：句子的主体，全句述说的对象。回答是“谁”或者“什么”。一般由名词、代词、不定式、动名词或从句担当，位于句首。
如：The boy needs a pen.
Smoking is bad for you = To smoke is bad for you
2.谓语：说明主语的动作或状态。回答“做(什么)”。由动词或系动词加表语担任，常置于主语后。
如：The train leaves at 6 o’clock.
She is reading.
3.宾语：表示动作的对象。回答做的是“什么”。一般由名词或代词担当，常置于谓语后。
如：He won the game.
4.表语：用以表述主语的特征、状态、身份等。回答是“什么”或者“怎么样”。一般由名词或形容词担任，置于系动词或be动词之后。
如：He is a student. We are tired.
注意：除了be 系动词外，还有一些动词也可以用作系动词，
（1）表感官的动词: feel, smell, taste, sound, look, appear, seem 等。
（2）表转变变化的动词: become, get, grow, turn, go等。
复数的变换
1.在后面加s。如：fathers, books, Americans, Germans, apples, bananas
2.x, sh, ch, s, tch后加es。如：boxes, glasses, dresses, watches, wishes, faxes
3.（1）以辅音字母加y结尾的变y为i再加es 如：baby-babies, family-families, duty-duties, comedy- comedies, documentary-documentaries, story-stories
（2）以元音字母加y结尾的直接加s。如：day-days, boy-boys, toy-toys, key-keys, ways
4.以o结尾加s(外来词)。如：radios, photos, 但如是辅音加o的加es：如: tomatoes西红柿, potatoes马铃薯
5.以f或fe结尾的变f为v再加es(s)。如：knife-knives, wife-wives, half-halves, shelf-shelves, leaf-leaves, yourself-yourselves
6.单复数相同(不变的)有：fish, sheep, deer鹿子, Chinese, Japanese
7.一般只有复数，没有单数的有：people,pants, shorts, shoes, glasses, gloves, clothes, socks
8.单词形式不变，既可以是单数也可以是复数的有：police警察局，警察, class班，同学, family家，家庭成员
9.合成的复数一般只加主要名词，多数为后一个单词。如：action movie-action movies, pen pal-pen pals; 但如果是由man或woman所组成的合成词的复数则同时为复数。如：man doctor-men doctors, woman teacher-women teachers
动名词(doing)
动名词相当于名词,在句子中可以做主语、宾语、表语、定语等。
1. 作主语
Fighting broke out between the South and the North.
南方与北方开战了。
2. 作宾语
Would you mind turning down your radio a little, please?
请问你介意调小一点收音机的音量吗?
3. 作表语
Babysister’s job is washing,cooking and taking care of the children.
保姆的工作是洗衣服,作饭和照看孩子。
neither与nor的用法
1.如前句是否定式从句,则主句用neither,而不用nor.
If you don't do it,neither should I.如果你不干,我也不干.
2.如后连续有几个否定句式,则用nor,不用neither.
He can't sing,nor dance,nor skate.
句子成分
1.主语：句子的主体，全句述说的对象。回答是“谁”或者“什么”。一般由名词、代词、不定式、动名词或从句担当，位于句首。
如：The boy needs a pen.
Smoking is bad for you = To smoke is bad for you
2.谓语：说明主语的动作或状态。回答“做(什么)”。由动词或系动词加表语担任，常置于主语后。
如：The train leaves at 6 o’clock.
She is reading.
3.宾语：表示动作的对象。回答做的是“什么”。一般由名词或代词担当，常置于谓语后。
如：He won the game.
4.表语：用以表述主语的特征、状态、身份等。回答是“什么”或者“怎么样”。一般由名词或形容词担任，置于系动词或be动词之后。
如：He is a student. We are tired.
注意：除了be 系动词外，还有一些动词也可以用作系动词，
（1）表感官的动词: feel, smell, taste, sound, look, appear, seem 等。
（2）表转变变化的动词: become, get, grow, turn, go等。
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