英语是我们学习的主要科目之一，英语作为国际性语言，学好英语自然有很多好处。学习英语要从最基础的知识开始学，而且需要端正学习态度，因为学习外语需要坚持。下面是小编给大家整理的高三英语语法知识点，希望能帮助到大家!
高三英语语法知识点
重点句型
It was + 时间段+before…."过了多久才(怎么样)……"
It was not long before…."不久，就……"
It will (not) be +时间段+before…."要过多久(不久)……才……"(before从句谓语动词要用一般时态)
[例句]
It was not long before he sensed the danger of the position.不久他就意识到他处境的危险。
It was five days before he came back. 五天后他才回来。
It will be half a year before you graduate from the school. 再过半年你才能毕业。
It will not be long before they understand each other. 他们大概不久就会互相了解。
in case of…(+n.) "以防;万一";
in case that…"以防，万一……"(谓语动词用一般现在时态或should+动词原形)
[例句]
In case of fire, what should we do?
Please remind me about it in case I forget/should forget. 万一我忘了，请提醒我。
In case (that) John comes/should come, please tell him to wait.
Please take your umbrella in case (that it rains/should rain).带上雨伞，以防下雨。
高三英语语法知识点
一、不定式做主语：
1、不定式做主语一般表示具体的某次动作。动名词doing表示习惯的，经常的动作。
e.g:Tofinishthebuildinginamonthisdifficult.
Todosuchthingsisfoolish.
Toseeistobelieve.(对等)
注:1).不定式作主语时,谓语用单数
2).当主语较长，谓语较短时，常用it做形式主语，而将不定式放到谓语的后面。
it做形式主语，不定式放在谓语动词之后常用于下列结构中：
(1)Itis/was+adj.+ofsb.todo…
(2)Itis+adj.+forsb.+todo…
Itiseasy/difficult/hard/foolish/unwise/right/wrong/unnecessary
(3)itis+a+名词+todo...
Itisapity/apleasure/apleasantthing/one’sduty/anhonor/ashame/acrime/noeasyjob…todo
Ittakes(sb.)sometime/courage/patience…todo…
Itrequirescourage/patience/hardwork…todo…
注意:probable和possible均可作表语，但possible可以用不定式作真实主语，而probable不能用不定式作真实主语。
Itisprobableforhimtocometothemeeting.(错)
Itispossibleforhimtocometothemeeting.
Itispossible/probablethathewillcometothemeeting.
高三英语语法知识点
1、所谓双重所有格就是指将 -’s 所有格与 of 所有格结合起来一起使用：
a friend of my father’s 我父亲的一位朋友
a photo of Mr Smith’s 史密斯先生的一张照片
2、双重所有格的使用场合：
①当被修饰名词前有指示代词、疑问代词、不定代词或数词等限定词时，一般要用双重所有格：
I don’t like that big nose of David’s. 我不喜欢大卫的那个大鼻子。
Which novel of Dickens’ are you referring to? 你谈的是狄更斯的哪部小说?
Some friends of my brother’s will come. 我兄弟的一些朋友要来。
【注】被双重所有格修饰名词前有指示代词时，通常带有一定的感情色彩(如赞赏、不满、厌恶等)：
That little daughter of your cousin’s is really a dear. 你表哥的那个小女儿真是逗人爱。(表赞赏)
That daughter of your cousin’s is constantly complaining. 你表哥的那个女儿老是在报怨。(表厌恶)
另外，被双重所有格修饰的名词前可以用不定冠词，但通常不用定冠词：
可以说：a poem of Shelly’s, a novel of Dickens’
不能说：the poem of Shelly’s, the novel of Dickens’
②有时既可用双重所有格也可用 of 所有格，但含义稍有差别。比较：
a photo of Mary’s 玛丽收藏的一张照片
a photo of Mary 玛丽照的一张照片
a criticism of William’s 威廉提出的批评
a criticism of William 对威廉的批评
高三英语语法知识点
一般现在时：am /is /are +及物动词的过去分词;
例：i am asked to the party today.
(2) 一般过去时：was /were+及物动词的过去分词;
例：i was asked to the party last night.
(3) 现在进行时：am /is /are being +及物动词的过去分词;
例：i am being asked to the party today.
(4) 过去进行时：was /were being +及物动词的过去分词;
例：i was being asked to the party that time.
(5)一般将来时：助动词will +be +及物动词的过去分词;
或：am /is /are going to +be +及物动词的过去分词;
例：i will be asked to the party tomorrow.
例：i am going to be asked to the party tomorrow.
(6)过去将来时：助动词would +be +及物动词的过去分词;
或：was /were going to +be +及物动词的过去分词;
例：i would be asked to the party the next day.
例：i was going to be asked to the party the next day.
(7)现在完成时：助动词has /have +been +及物动词的过去分词;
例：i has been asked to the party today.
(8) 过去完成时：助动词had +been +及物动词的过去分词;
例：i had been asked to the party the day before.
另外,含有情态动词的被动语态构成为：情态动词+助动词be +及物动词的过去分词.
例：i may be asked to the party today.
高三英语语法知识点
It的用法
1、It除了代替人和物以外,还可以作形式主语.而真正的主语(不定式、动名词或从句)则放于谓语或表语之后.
例如：It is nor easy to finish the work in two days.
然而有少数表语之后接动名词作真正的主语.这些表语是：无助(no help)、无用(no use)、没好处(no good);工作(hard work)、费时(a waste of time)、又危险(a danger).
例如：A、It is no use crying over spilt milk.
B、It is a waste of time waiting for him.
2、It还可以作形式宾语.通常下列动词后面可接it作形式宾语：2f2tcjm(find,feel,think,take,consider,judge, make).
例如：A、He made it clear that he was not interested in this subject.
B、I think it no use arguing with him.
3、It用于强调句式.要强调句子的某一部分(主语、宾语、 状语),可以把it当作先行词.这种句子的结构是：It is(was)+ 被强调部分+that(who)+句子的其余部分.
例如：A、It iS Professor Lin who teaches us English—(强调主语)
B、It was in Shanghai that l saw the film.—(强调状语)
C、It was in 1990 that I worked in the factory.(同上)
但要注意与定语从句的区别.
例如：D、It was 1990 when I worked in the factory.(定语从句)
在强调句式里,我们把强调结构It is(was)…that除去,句子还很完整.如例句C.而例句D就不能.
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