高二英语选修的有用知识点归纳1
1、at
如：常用词组有： at noon, at night
表示时间的 at, in, on：表示片刻的时间，at 8 o’clock，at midnight, at the end of, at thattime, at the beginning of, at the age of, at Christmas, at New Year 等。
in 表示一段的时间
如：in the morning, in the afternoon, in the evening, in October, in 1998, insummer, in the past, in the future 等。
on 总是跟日子有关，on Monday, on Christmas morning, on the following, on May Day,on a warm morning 等。
2、表示时间的 since 和 from：since 表示从过去到现在的一段时间的过程，常与现在完成时连用：from表示从时间的某一点开始，不涉及与现在的关系。一般多与现在时、过去时、将来时连用。
如：I hope to do morning exercises from today./ We have not seen each othersince 1995.
3、表示时间的 in 和 after：两者都表示“在(某个时间)之后，区别在于in表示“在(一段时间)之后” ，而 after则表示“在(某一具体时间点之后)，in和将来时态连用，after 短语和过去时态或将来时态连用。
如：We’ll be back in three days.
After seven the rain began to fall.
What shall we do after graduation?
After two months he returned.
注意：after 有时也可以表示在一段时间之后(常用在过去时里)
4、表示地理位置的 in, on, to：in 表示在某范围内，on 指与什么毗邻，to 指在某环境范围之外
如：Changchun is in the northeast of China./ Mongolia is on the north ofChina./ Japan is tothe east of China.
5、表示“在……上”的 on 和 in：on 只表示在某物的表面上，而用 in 表示占去某物一部分，表示……上。
如：There is a book on the piece of paper./ There is an interesting articlein the newspaper./ He dug a hole in the wall.
高二英语选修的有用知识点归纳2
1. first aid 的意思是“急救”，例如：first aid to the injured 给予伤员的急救。
短语联想
give/offer aid 援助 come to sb's aid 帮助某人
teaching aids 教具 medical aid 医疗救护
with the aid of 借助于
get injured 受伤，在现代英语中大量地出现了由“get + 及物动词不达意的过去分词”构成的被动语态，这叫 get -型被动语态。又如：
The computer got (was)damaged when we were moving.
My bike is getting (is being)repaired row.
2. Protect 动词，“保护、维护”，用于句式“protect + 名词 + against/from + 名词”。
e.g. He is wearing sunglasses to protect his eyes from the strongsunlight.
【短语联想】
? Keep... from... 不让/避免
? stop... (from) ... 阻止
? prevent...(from) ... 妨碍/防止
?disable... from... 使……失去(能力/资格)
?save... from... 挽救、拯救
3.depend on 取决于。
e.g. The amount you pay depends on where you live.词义拓展
depend on 依靠，依赖：His family depends on him. 他的一家人全靠他养活。
依赖，信任：We are depending on you to finish the job by Friday.
4. squeeze 动词，意思是“榨取”、“挤出”，例如：squeeze an orange 榨橘子
squeeze + 名词 + out(of/from) + 名词，
e.g. Those blackmailers intended to squeeze more money out of him.
5. hurt既可作及物动词，作“伤害”、“使受伤”解，也可作不及物动词，作“疼痛”、“感到疼痛”解。既可表达身体的受伤，也可以表达情感的伤害。例如：
e.g. The little boy has fallen off a ladder and hurt himself.
The driver hurt himself in the accident. 司机在事故中受了伤。
6. unless 除非……;如果不……。如：
7. icy adj. 冰凉的
-y 是个形容词后缀。如：
windy 有风的 hilly 多小山的 sleepy 困倦的
greeny 略呈绿色 spicy 辛辣的 woody 树木茂密的
thirsty 饥渴的 dirty 脏的 snowy 下雪的
8. in place 放在适当的地方。如：
e.g. The librarian put the returned books in place. 图书管理员把还回的图书放到原处。
Yon'd better put things back in place.Otherwise, it will be difficult tofind things.
9. sense n. 感觉
?sense of touch 触觉 sense of sight 视觉
? sense of hearing 听觉 sense of smell 嗅觉
? sense of humour 幽默感 sense of beauty 美感
?ense of hunger 饥饿感 the sixth sense 第六感
10. variety n. 多样, 种类,
a variety of… 各种各样……
【词语联想】
various a. 不同的, 各种的, 多方面的, 许多的
e.g. Everyone arrived late at the party for various reasons.
【重点句型】
1. Remove clothing using scissors if necessary unless it is stuck to theburn.
除非衣服粘贴在烧伤面上，否则都要把衣服脱掉。如果需要的话，可以使用剪刀。
unless是连词，意为“如果不，除非”。在真实条件句中，unless引导的肯定条件状语从句，可以和if...not...引导的否定状语从句互换。
Unless you change your mind，I won，t be able to help you.
=If you don?t change your mind，I won ’t be able to help you.
除非你改变想法，否则我不能帮助你。
I want you to keep working unless I tell you to stop.
=I want you to keep working if I don’t tell you to stop.
如果我没说让你停，你就得继续干。
注意：unless 不可用于假想的事情，因此当if...not引导非真实条件状语从句时，一般不可改用unless。
高二英语选修的有用知识点归纳3
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: To finish the building in a month is difficult.
To do such things is foolish.
To see is to believe. (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)It is/was +adj.+of sb. to do…
(2) It is +adj.+for sb.+to do…
It is easy / difficult / hard / foolish / unwise / right / wrong /unnecessary
(3) it is +a +名词+ to do...
It is a pity / a pleasure / a pleasant thing / one’s duty / an honor / ashame / a crime / no easy job… to do
It takes (sb.) some time / courage / patience …to do…
It requires courage / patience / hard work… to do…
_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。
It is probable for him to come to the meeting.(错)
It is possible for him to come to the meeting.
It is possible / probable that he will come to the meeting.
二、不定式做表语
主语是以aim duty hope idea intention plan job suggestion wish purpose task等为中心词的名词词组 或以 what 引导的名词性从句表示，后面的不定式说明其内容, 不定式作表语常表示将来或现在的动作或状态。
eg :My idea is to climb the mountain from the north.
Your mistake was not to write that letter.
What I would suggest is to start work at once.
三 、动词不定式作宾语
以不定式结构为宾语的动词有：
ask, agree, care, choose, demand, decide, expect, fail, help, hope, learn,manage, offer, plan, prepare, pretend, promise, refuse, want,wish等只能用动词不定式作宾语
口诀(接不定式作宾语的动词)
想要学习 早打算( want learn plan)
快准备 有希望( prepare hope wish expect)
同意否 供选择(agree offer choose)
决定了 已答应(decide be determined promise)
尽力去 着手做(manage undertake)
别拒绝 别假装(refuse pretend)
失败不是属于你(fail)
e.g.Tom refused to lend me his pen.
We hope to get there befo