幸福不在知识之中，而在对知识的获取之中!在永远的获取中，我们永远被赐福;无所不知则是魔鬼的诅咒，下面我给大家分享一些高中英语选修八重点知识，希望能够帮助大家，欢迎阅读!
高中英语选修八重点知识1
①课内高频词汇
1means (n) 方法 ;手段→meaning (n) 意思→mean (v) 打算;意味→meaningful (adj) 有意义的
2boom (n) (人口、贸易的)繁荣 (vi) 处于迅速发展时期
3majority (n) 大多数;大半→major (adj) 主要的 (v) 主修→minority (n) ( 反义词 ) 少数;少数民族→minor (adj) 较小的;次要的
4distinct (adj) 清晰的;明显的;明确的→distinction (n) 差别;区分;卓著
5indicate (vt) 指出;标示;表明;暗示→indication (n) 象征;标示;表明;暗示
6racial (adj) 人种的;种族的→race (n) 种族;比赛→racism (n) 种族主义;种族歧视
7elect (vt) 选择;决定做某事;选举某人→election (n) 选举
8appear (v) 看上去;出现→apparent (adj) 显而易见的;显然的;表面上的→apparently (adv) 显然地;显而易见地
9applicant (n) 申请人→apply (vi) 申请→application (n) 申请书 ;申请
10society (n) 社会→social (adj) 社会的→socialism (n) 社会主义→socialist (n) 社会主义者
11punish (vt) 惩罚→punishment (n) 惩罚
12occur (vi) 发生;出现→occurence (n) 事件;发生的事→occurred (过去式/过去分词)
13luggage (n) 行李→( 近义词 )baggage (n) 行李;超重行李
14hire (vt&n)租用;雇用→(反义词)fire (vt) 解雇
15customs (n) 海关;关税;进口税→custom (n) 风俗;习惯 →customer (n) 顾客;主顾
16slip (vi) 滑动;滑行;滑跤 (n) 滑动;滑倒→slipper (n) 拖鞋→slippery (adj) 滑的
②重点 短语
1by_means_of用……方法;借助……
2keep_up 坚持;维持;沿袭(风俗、传统等)
3team_up_with 与……合作或一起工作
4take_in 包括;吸收
5live_on 继续存在
6make_a_life 习惯于新的生活方式、工作等
7apply_for 申请;请示得到
8back_to_back 背靠背
9mark_out 画线;标出……界线
10a_great_many 许多
③课内重点句型汇总
1it is likely that“很可能……”
However, it_is_likely_that (很可能)Native Americans were living in California at least fifteen thousand years ago
2why引导的表语从句，表示“……的原因”
That_is_why(那就是为什么)today over 40% of Californians speak Spanish as a first or second language
3过去分词作原因状语(必修五学习过的重点内容，需要加强巩固)
People from different parts of the world, attracted_by (被吸引)the climate and the lifestyle, still immigrate to California
4名词性从句作介词的宾语
Exactly when the first people arrived in what_we_now_know_as (我们现在称之为) California, no one really knows
5it作形式主语的主语从句
It_is_believed_that (人们认为)before long the mix of nationalities will be so great that there will be no distinct major racial or cultural groups, but simply a mixture of many races and cultures
高中英语选修八重点知识2
课内高频词汇
1differ(vi) 不同;相异→difference(n) 不同;差异→different(adj) 不同的
2exact(adj) 精确的;准确的→exactly(adv) 精确地;准确地
3undertake(vt) 着手;从事;承担→undertook(过去式)→undertaken (过去分词)→undertaking (n) 任务;项目;事业
4regulation(n) 规则;规章;法规→regular(adj) 规则的;有规律的
5cast(vt) 扔;投;掷→cast(过去式/过去分词)
6altogether(adv) 总共;完全地
7object(vi) 反对;不赞成→objection(n) 不赞成;反对;异议
8moral(adj) 道德(上)的;伦理的→morally(adv) 道德上地;伦理上地
9accumulate(vt & vi) 积累;聚积→accumulation(n) 积累;聚积
10assumption(n) 假定;设想→assume(vt) 假定;设想
11shortly(adv) 立刻;不久
12retire(vi) 退休;离开→retirement(n) 退休，退职;退役→retired(adj) 退休的; 离职 的
13bother(vt) 打扰(vi) 操心(n) 烦扰
14resist(vt) 抵抗;对抗→resistance(n) 抵抗力;反抗→resistant(adj) 有抵抗力的;耐……的
15obtain(vt) 获得;赢得→obtainable(adj) 可获得的;可得到的
16reason(n) 理由;原因→reasonable(adj) 合情理的;讲道理的;公道的→unreasonable(adj) (反义词)不合情理的
17fair(adj) 公平的;适当的;合理的→fairness(n) 公平→fairly(adv) 公平地;相当地
02重点短语
1pay_off得到好结果;取得成功;偿清
2cast_down 沮丧;不愉快
3have_a_great_impact_on 对……有重大影响
4object_to 反对
5in_favor_of 赞成;支持
6owe_to_ 把……归功于……
7(be)_bound_to_(do) 一定或注定(做)……
8strikeinto_one's_heart 使……刻骨铭心
9from_time_to_time 不时;偶尔
10bringback_to_life 使复生;使复活
11in_vain 白费力气;枉费心机
12in_good/poor_condition 状况很好(坏);情况很好(坏)
03课内重点句型汇总
1while表对比关系，“然而;可是”
Cloning plants is straightforward while(然而)cloning animals is very complicated
2当now，then位于句首，谓语是come，appear等时，主句完全倒装。(小伙伴们记得去回顾一下必修五的倒装句)that引导同位语从句
Then_came(传来)the disturbing news that Dolly had become seriously ill
3Theadvantage is that“其优点是……”，that引导表语从句
The_advantage_is_that(优点是)if there is a new illness some of these animals may die, but others willsurvive and pass on the ability to resist that disease to the next generation
4based on“建立在……的基础之上”，过去分词作状语
based_on(建立在……基础之上)what we know now, you can not clone animals that have been extinct longer than10,000 years
高中英语选修八重点知识3
课内高频词汇
1distinguish(vi&vt) 显示……的差别;使……有所不同;辨别→distinguished(adj)杰出的;著名的
2passive(adj) 被动的;消极的;被动语态的→activeadj(反义词)积极的
3seize(vt) 抓住;捉住;夺
4freezing(adj) 冰冻的;严寒的→frozen(adj) 冷冻的;结冰的
5bear(vt) 忍受;忍耐;负担→bore(过去式)→born (过去分词)
6tap(vt&vi) 轻打;轻拍;轻敲(n) 轻轻地敲击(声);(水)龙头
7practical(adj) 实际的;实践的;实用的→practise(v) 练习→practice(n) 练习，实践
8merciful(adj) 宽大的;仁慈的;慈悲的→mercy(n)宽大;仁慈
9convenient(adj) 便利的;方便的;就近的→convenience(n) 便利;方便→inconvenient(adj) (反义词)不方便的;引起麻烦的
10caution(n) 小心;谨慎→cautious(adj) 小心的;谨慎的→cautiously(adv) 小心地;谨慎地
11expectation(n) 预料;期待;期望→expect(v) 预料;期待;期望;认为→unexpected(adj) 未预料到的
12innocent(adj) 清白的;无罪的;天真的→innocence(n) 天真;清白
13associate(vt) 联想;联系(n) 同伴;伙伴→association(n) 协会;社团;联合;联想
14current(n)(水或气)流;电流(adj)现在的;当前的→currently(adv)现时;当前;普遍地→currency(n)流行;通货;货币;通用
02
0
重点短语
1call_up给……打电话
2set_about 开始;着手
3dive_into 迅速把手伸入;一心投入
4set_out_(to_do) 开始(做)
5get_through 设法联系上(尤指打通电话);(设法)做完;通过
6now_and_then 偶尔;有时
7hang_on 不挂断;紧紧握住;稍等
8out_of_order 次序颠倒;发生故障
9ring_back 回复电话
10ring_off 挂断电话
课内重点句型汇总
1thereseems to be“好像有……”
Thefirst thing I did was to see if there were any products that might help me, butthere_only_seemed_to_be (看来只有)powders designed to kill snakes
2“only+状语从句”引起的倒装
Only_after_you_have_had_that_recognition(只有在已得到这种认可之后) can you say that you are truly an inventor
3noruntil“直到……才……”
Nor_will_you_receive_a_patent_until(你才能获得专利，直到) a search has been made to find out that your product really is different from everyone else's
4It'sa matter of“这是……的问题”
Nowit's_a_matter_of(只是)waiting and hoping
5everytime“每次……”引导时间状语从句
Every_time(每次)you do you will be certain to find something that you have never seen before
6祈使句+and/or+陈述句
Follow_it_up(跟随它)，explore all around it, and before you know it, you will have something worth thinking about to occupy your mind
高中英语选修八重点知识4
1课内高频词汇
1outcome(n) 结果;效果
2remark(n) 谈论;言论;评述(vt&vi) 谈论;评论;说起→remarkable(adj) 显著的;引起注意的
3betray(vt) 显露出(本来面目);背叛→betrayal(n) 背叛
4shabby(adj) 破旧的;寒酸的
5acquaintance(n) 相识;了解;熟人→acquaint(v) 认识
6status(n) 身份;地位;职位→(形近词)statue(n) 雕像
7rob(vt) 抢劫;盗窃;剥夺→robbery(n) 抢劫(行为)
8compromise(n&vi) 妥协;折衷→compromising(adj)有失体面的;不宜泄露的
9overlook(vt) 俯视;忽视;不理会
10fade(vi&vt) (使)褪色;减弱;逐渐消失
11hesitate(vi) 犹豫;踌躇→hesitation(n) 犹豫;踌躇
12fortune(n) 机会;运气;大笔的钱→fortunate(adj) 幸运的→fortunately(adv) 幸运地;幸好
13disgusting(adj) 使人反感的;令人厌恶的→disgusted(adj)感到厌恶的→disgust(vt) 厌恶;嫌恶
14classify(vt) 分类;编排→classification(n) 分类;编排→classified(adj) 分类的;保密的
15effective(adj) 有效的→effect(n) 效果;作用
16horrible(adj) 可怕的;恐怖的→horror(n) 恐怖
17uncomfortable(adj) 不舒服的;不安的→uncomfortably(adv) 不舒服地;不安地→comfort(n) 舒适(vt) 安慰→comfortable(adj) (反义词)舒服的
18extraordinary(adj) 不同寻常的;非凡的→ordinary(adj) 普通的;一般的
19mistaken(adj) (见解或判断上)错误的;不正确的→mistake(v)弄错(n) 错误
20adaptation(n) 适应(性);改编本→adapt(v) 适应;改编
2重点短语
1in_disguise伪装(的);假扮(的)
2passoff_as (把某人)改变或冒充成……
3make_one's_acquaintance 结识;与……相见
4generally_speaking 一般来说
5in_terms_of 就……来说;从……角度
6rob_sb_of_sth 抢劫某人某物
7showin 带或领……进来
8once_more 再一次
9in_need_of 需要……
10fade_out (声音、画面)逐渐模糊;渐淡
11in_amazement 震惊地;惊讶地
12be_superior_to 优于……
13a_handful_of 一把;几个
14shelter_from_rain 避雨
15the_other_day 几天前;那一天
16fancy_oneself 自以为是
3重点句型
1“while/when+现在分词”作时间状语
While_watching(一边看),he makes notes
2“be of+抽象名词”表示具有(某种特征或属性)的
Willthat be_of_any_use (有用处)toyou
3what if句式，“如果……又怎么样呢”
What_if_I_was(如果我是又怎么样呢)
4every time 引导时间状语从句，“每当……的时候”
But they betray themselves every_time_they_open_their_mouths(每当张嘴的时候)
5“once+过去分词”的省略结构
But,sir, (proudly) once_educated(一旦被 教育 )to speak properly, that girl could pass herself off in three months as a duchess at an ambassador's garden party
6形容词(短语)作状语
Henry Higgins and Colonel Pickering are sitting deep_in_conversation(深入的交谈)
7“if+had done，主句用would have done”表示对过去的虚拟(选修六的虚拟语气需要小伙伴自己去回顾)
I'd_never_have_come_if_I'd_known_about(如果我知道……我是不会来的)this disgusting thing you want me to do
4单元语法 总结
复习过去分词作状语
过去分词作状语，可表示时间、原因、条件、让步、伴随等意义，此时相当于一个状语从句。
1时间状语
When he was told his mother was ill, Li Lei hurried home quickly(用分词改写)
→Told his mother was ill, Li Lei hurried home quickly
2原因状语
As they were encouraged by the speech, the young people made up their minds to take up the struggle
→Encouraged by the speech, the young people made up their minds to take up the struggle
3条件状语
If he is given another chance, he will do better
→Given another chance, he will do better
4让步状语
Although he was laughed at by many people, he continued his study
→Laughed at by many people, he continued his study
5方式或伴随状语
She walked out of the house and she was followed by her little daughter
→She walked out of the house, followed by her little daughter
分词作状语有时可在前面加上when, while, if, once, though, unless等，以明确作何种状语。
Unless he is invited, he won't go to the party
→Unless invited, he won't go to theparty
当分词的逻辑主语与主句的主语不一致时，分词可以有自己独立的主语，二者构成独立主格结构。
When our homework was finished, we went home
→Our homework finished, we went home
高中英语选修八重点知识5
课内高频词汇
1alternative(n) 可能的选择(adj) 供选择的;其他的
2interrupt(vt&vi) 打断……讲话;打岔;暂时中断或中止
3acute(adj) 有观察力的;敏锐的;严重的;深刻的
4assume(vt) 假定;设想;承担→assumption(n) 假定
5significance(n) 意义;意思;重要性;重要意义→significant(adj) 重要的6somehow(adv) 以……方式;不知怎么地
7delete(vt) 删;删除
8applaud(vi&vt) 鼓掌欢迎;赞赏→applause(n) 鼓掌
9accelerate(vi&vt) 加速;促进→acceleration(n) 加速
10arrest(vt) 逮捕;吸引(n) 逮捕;拘留→arresting(adj) 引人注意的;很有吸引力的
11starvation(n) 挨饿;饿死→starve(vi) 挨饿;饿死
12accuracy(n) 精确;准确→accurate(adj) 准确的;精确的
13messy(adj) 凌乱的;脏的→mess(n) 凌乱;脏
14sharpen(vi&vt) (使)锋利;尖锐;清晰→sharp(adj) 锋利的;尖锐的→sharpener(n) 磨具;削具
15division(n) 分割;划分;分配;分界线→divide(vt) 划分;隔开;分割
16ripe(adj) 成熟的→ripen(v) 使……成熟;成熟
17receptionist(n) 接待员;招待员→receive(v) 收到;接待→reception(n) 接待处;欢迎
18systematic(adj)有系统的;有计划的;有条理的→system(n)系统;体系19analysis(n) (planalyses)分析→analyse(vt)分析;分解
2
重点短语
1regardless_of不管;不顾
2at_most 至多;最多
3cut_up 切碎
4be_fed_up_with 受够了;饱受;厌烦
5look_ahead 向前看;为将来打算
6date_back_to 追溯到……
7arrest_sb_for 因……而逮捕某人
8with_relief 欣慰地;轻松地
9be_proud_of 以……为骄傲
10turn_to_sb_for_help 向某人求助
11keep_out 阻止进入
12have_no_alternative_but_to_do 别无选择;只好……
3
重点句型
1Itseems (to sb) that“(对某人来说)似乎……”
It_seems_that(看起来似乎) they used the sharpened stone tools to cut up animals and remove their skin
2as引导非限制性定语从句，指代主句的内容，意为“正如;正像”
Yes,indeed, as_the_botanical_analyses_have_shown_us(正如植物学的分析结果已经向我们展示的), all the fields around here used to be part of a large shallow lake
3if only 常引导虚拟语气的条件句或感叹句，表示“要是……就好了”
If_only(要是……就好了)it could be just like last year!
4“had+过去分词when”表示“刚刚……这时……”
She had_almost_reached (就要到达)her destination when(这时)a delicious smell arrested her progress and she stopped
5only to do表示意想不到的或令人失望的结果，意思是“结果却……”
Abruptly she sat down, only_to_be_scooped_up (结果却被……搂了起来)by her laughing, shouting sister, Luna
单元语法总结
复习动词时态：现在完成进行时
现在完成进行时表示动作从过去某一时间一直持续到现在或离现在不远的时间，其动作是否持续下去，则由上下文决定。
(1)叙述某一动作从过去开始，一直持续到现在，仍在继续之中或刚刚停止。常与for,since, all morning/day/week等状语连用。
The telephone has been ringing for almost a minute Why doesn't someone answer it
(2)表示重复的动作。有时现在完成进行时表示的动作并不是一直不停地进行，而是在断断续续的重复。
—We've spent too much money recently
—Well,it isn't surprising Our friends and relatives have been coming around all the time
(3)表示“刚才、近来”发生的动作，一般不再继续，此时一般通过上下文语境来判断。
She has been sweeping the street allday She is too tired
(4)带有浓重的感情色彩，强调持续了“那么久”或做得“那么辛苦”。
Oh,you've come at last! I have been waiting for you for two long hours
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如果说阻止他人获取知识就是扼杀知识，那么对扼杀知识习以为常，就会导致对杀害人习以为常——因为确切而言，人就是知识;还会导致对人的缺失习以为常。下面我给大家分享一些高中英语选修七知识点，希望能够帮助大家，欢迎阅读!
高中英语选修七知识点1
Unit1：
1 disability n无能;残疾disabled adj伤残的able adj能干的;能够的
2 ambition n野心，雄心ambitious adj有雄心的，野心勃勃的
3beneficial adj有益的benefit v&n受益;利益，好处
4 independent adj独立的independence n独立depend v依靠，依赖
5encouragement n鼓励encourage v鼓励courage n勇气，精神
单词：
1ambition (n) 雄心
2beneficial (adj) 有益的
3adapt (v) 使适应;改编
4conduct (n) 行为 (v) 指挥
5resign (v) 辞职
6companion (n) 同伴
7access n (接近的) 方法 ;通路;可接近性
8suitable adj适合的, 适当的;
9annoy vt 使生气，使烦恼; 招惹; 妨碍
10adequate adj适当的, 足够的
重点词组in other words 换句话说 cut out 切掉,删掉 out of breath 上气不接下气
sit around 闲坐着 make fun of 取笑 all the best一切顺利
as well as 也, 又; 和……一样好
重点词汇
1 ambition (n) 雄心
ambitious adj 志向远大的; 有雄心壮志的;有野心的
2 beneficial (adj) 有益的
benefit v &n有助于;受益;利益，好处
be beneficial to sth/sb对……有益
be of benefit to对……有益
for the benefit of为了……(的利益)
benefit from从……中受益
3 adapt (v) 使适应;改编
adapt (oneself) to sth适应某物
adapt…to…使……适应……
adapt sth for sth from sth根据某事将……改编成……
be adapted from… 由……改编
4 conduct (n) 行为 (v) 指挥
conductor n 领导者, 经理,
a bad conduct恶劣行为
under the conduct of在指导[管理]下
5 resign (v) 辞职;委托, 把交托给(to, into)
resign one's position (as secretary) 辞去(秘书)职务
resign office辞职
resign oneself to听任(某种影响); 只好(做某事)
resign oneself to one's fate听天由命
resign to 把 托付给
6 companion (n) 同伴
make companions of 与作伴， 与为友
companions in arms战友
a faithful companion忠实伴侣
7 access n (接近的)方法;通路;可接近性
accessible adj 易接近的, 可到达的,
accessible to(prep)
8 suitable adj适合的, 适当的;
suit v 合适, 适合, 相配,
unsuitable adj 不适合的, 不相称的
be suitable for (doing) sth/sb 很适合(做)……
9 annoy vt 使生气，使烦恼; 招惹; 妨碍
be annoyed at/by sth因为某事而感到困扰
get /be annoyed with sb生某人的气
annoying 令人恼火的
annoyed 恼怒的;烦恼的
10 adequate adj适当的, 足够的; 差强人意的
高中英语选修七知识点2
Unit2:不定式
1不定式的被动形式
当不定式与逻辑主语之间是被动关系时 即不定式的逻辑主语是不定式所表示动作的承受者不定式一般要用被动形式。其被动式可以分为两种一般式和完成式。
(1) 一般式to be done表示不定式动作在谓语动词之后或者同时发生。
It is a great honor to be invited to speak here 很荣幸被邀请在这里讲话。
The novel is said to be published next month 据说这本小说下月要出版。
(2) 完成式 to have been done 表示不定式动作发生在谓语动词之前。
The book is said to have been translated into six languages
这本书据说已经被翻译成六种语言。
The boss preferred to have been given more work to do
老板宁愿被分给更多的工作做。
被动 一般式 to be done 完成式 to have been done
2不定式被动形式的作用
(1)作主语
It's an honor to be invited to the ceremony
很荣幸被邀请赴宴。
It's a pity to be kept in the house in such fine weather
在这样好的天气被关在家里真是遗憾。
(2)作表语
The letter is to be sent by airmail 这封信笺要空邮。
(3) 作宾语
She didn't like to be treated as a child
她不喜欢被当成孩子。
The boy asked to be given an opportunity to try again
那男孩要求给他再试一次的机会。
(4)作宾语补足语
I'd like my bedroom to be cleaned 我想整理一下我的卧室。
(5)作定语
He was the last one to be asked to speak at the meeting
他是最后一个在会上被邀请发言的人。
(6)作状语
His mother left the small village never to be seen again
他母亲离开了那个小山村，再也没有人见过她。
3不定式有些要注意的地方
(1) 感官动词和一些使役动词的不定式的主动形式要省去to但在变成被动语态后需要加上to能这样用的动词或动词词组有make have let see hear notice listen to watch等。
如：We often see him act like that He is often seen to act like that 我们常常看到他那样做。
(2)在can't help buthave nothing to do but结构中介词but后的不定式省去to。
如：I can't_help_but suspect his motive 我不禁怀疑起他的动机。
I have nothing to do but watch TV 我没什么事情可做除了看电视。
(3)不定式有时要用主动形式表示被动意义
①形容词以及含有形容词的名词后的不定式，一般用主动形式表示被动意义 其中形容词常见的有easy difficult important impossible等。
如：The work is impossible to finish in two days 工作不可能两天之内完成。
English is not so easy to learn 英语并不好学。
① 一些固定用法 如“挨骂 受责备 受批评” 用be to blame “(东西等)出租”用to let。
V-ing 的用法：
1作主语
Swimming is good for health
2 作表语 Teaching is learning教学相长
注意：1)动名词和不定式都可以作主语，动名词作主语表示一般或抽象的多次性行为，不定式作主语往往表示具体的或一次性的动作。
如：
Playing with fire is dangerous (泛指玩火)
To play with fire will be dangerous(指一具体动作)
2) V-ing形式和不定式都要有对称性;当主语是不定式时，表语也用不定式;反之，当主语是 V-ing 形式时，表语也用 V-ing 形式。
To see is to believe= Seeing is believing
3) It’s no use (good) doing sth
It’s a waste of time doing sth
it 作形式主语, 只用V-ing,不用不定式。
※ It is + adj + (for sb ) to do sth
It is no use crying over spilt milk覆水难收。
It is a waste of time talking (talk) to him
It is important for me to learn (learn) English
3作宾语 V-ing 形式既可作动词的宾语, 也可作介词的宾语。
We would appreciate hearing from you我们会珍惜你的来信。
高中英语选修七知识点3
Unit4：定语从句
1 关系代词 that, which (物) that, who, whom(人)whose(人和物)
①关系代词在从句做主语，宾语，表语。当做宾语时，可以省略。
A plane is a machine that can fly(that做主语，先行词是物)
The book (which) I gave you was worth $10(which先行词是物，在从句中作宾语可省，) She is the pop star (that) I want to see very much(that先行词是人，在从句中做宾语可省)
②who在从句中多做主语，whom只能做宾语，(介词和动词后)
Do you know the man who is talking with your mother(who在从句中做主语，先行词是人)
The boy (whom) she loved died in the war(whom在从句中做宾语，可省)
③ whose先行词即可是人也可是物。
I like those books whose topics are about history The boy whose father works abroad is my deskmate
2 关系副词
where 在从句中作地点状语 when 在从句中作时间状语 why 在从句中作原因状语 I will never forget the day when we met there
This is the house where I was born
I can’t imagine the reason why he turned down my offer
三、介词/介词 短语 +关系代词(which, whom)
Mr Smith is the person with whom I am working This is the hotel in which you will stay
关系副词when, where, why的含义相当于"介词+ which"结构，因此常常和"介词+ which"结构交替使用。
例如：There are occasions when (on which) one must yield 任何人都有不得不屈服的时候。
Beijing is the place where(in which) I was born 北京是我的出生地。
Is this the reason why (for which) he refused our offer 这就是他拒绝我们帮助他的理由吗
四、 限制性定语从句和非限制性定语从句
1 形式不同
2 作用不同
限定性定语从句用于对先行词的意义进行修饰、限制和识别，如果去掉，就会造成句意不完整或概念不清;而非限定性定语从句用于对先行词起补充说明作用，如果省略，句意仍然清楚、完整：
3 翻译不同 He is the man whose car was stolen 他就是汽车被窃的那个人。 I’ve invited Jim, who lives in the next flat 我请了吉姆，他就住在隔壁。
4 先行词不同
五、 as引导的定语从句 as可以引导限制性和非限制性定语从句，在从句中做主语，宾语和表语。翻译成“像一样”或“像” suchas 像一样，之类 the sameas 和一样
He is such a clever boy as everyone likes(as在从从句中做宾语，)
That’s the same tool as I used last week
六、 as引导的定语从句和which的区别
①which 限制性非限制性位于句后修饰整句或先行词
Beijing, which is the capital of China, is a very beautiful city
As is well known, he is a famous film star in the 1980s
② as 多 和 被 动 语 态 连 用 ， be known, be said, be reported, be announced, be expected等
③当非限制性定语从句是否定时，只能用which。
He came here very late, which was unexpected
七、 特殊情况
只能用that的情况：
1先行词为all, everything, anything, nothing, little, much,等不定代词时
2先行词被all, any, every, each, much, little, no, some, few等修饰时
3先行词有形容词最高级修饰时
4先行词有序数词修饰时
5先行词既指人又指物时
6先行词被the only, the very修饰时
7句中已经有who或which时，为了避免重复时
例如：
1He told me everything that he knows
2All the books that you offered has been given out
3This is the best film that I have ever read
4We talked about the persons and things that we remembered
5He is the only man that I want to see
6Who is the man that is making a speech
二、 只能用which不能用that的情况:
1 非限制性定语从句
2 介词+which
3 the way 做先行词时，定语从句可由that, in which 引导或不用引导词。
4 当先行词是point, situation, stage等时，引导词用where
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