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摘自《简明英语语法》在英文中，有两种定语从句：限定性定语从句与非限定性定语从句。这两种定语从句在其功能和形式方面都有明显的区别：限定性定语从句限定性定语从句与主句的关系很紧奏，对其先行词起限定、修饰的作用。如果将其去掉，会影响句子意思的完整性；有时甚至于引起费解、误解。例如：Rainforests are being cleared for valuable timber and other resources to speed up the economic growth of the nationsin which they are located 为了加速他们各自所在国家的经济发展，热带雨林作为有价值的原木和其他资源正为人们所砍伐。Ocean currents affect the climates of the lands near which they 洋流影响其流经的附近地区的气候。They explained the reason to us why they had hated us 他们向我们解释为什么他们不喜欢我们的原因。非限定性定语从句非限定性定语从句在形式上就与主句很松散，它与主句之间有一个逗点"，"隔开；它对其先行词没有限定、修饰的作用，只起补充、说明的作用。有时也用它来对全句进行补充、说明。即使将其去掉，也不会影响句子意思。由于上述原因，非限定性定语从句在表达意思方面也有别于限定性定语从句。另外，非限定性定语从句在中文译文里，我们往往将其作为一个分句处理，而不把它作定语翻译。 例如：Earlier , the Babylonians had attempted to map the world , but they presented it in the form of a flattened disc rather than a sphere , which was the form adopted by Ptolemy （此句中，非限定性定语从句是对先行词a sphere进行补充、说明。）更早之前，巴比伦人曾试图绘制世界地图，但是他们把它绘制成平盘状而不是托勒密所采用的球体状。The combination of satellites, which transmit information , computers , which store information , and television , which displays information , will change every home into an education and entertainment center （此句中，三个非限定性定语从句分别对三个先行词：satellites ，computers和television进行补充、说明。如果去掉这三个非限定性定语从句，那么句子可简化为：The combination of satellites , computers and television will change every home into an education and entertainment center ）卫星能传输信息，计算机能储存信息，电视能显示信息，把这些手段结合起来可以使每个家庭都成为教育娱乐的中心。The sun heats the earth , which makes it possible for plants to grow （此句中，非限定性定语从句是对全句进行补充、说明,将全句表达的意思看成"一件事情）。太阳给予大地热，这就使植物的生长成为可能。The old man has a son , who is in the army （此句中，非限定性定语从句是对先行词son进行补充、说明。但本句所传达的信息是："这位老人只有一个儿子" 。如果将此句改写成限定性定语从句：The old man has a son who is in the army 那位老人有一个在部队工作的儿子。那么，限定性定语从句就要对先行词son进行限定、修饰。这样一来，句子所传达的信息就变成了："这位老人有一个儿子在部队工作，还有其他的儿子在干别的工作"。）那位老人有一个儿子，他在部队工作。
Could you please lend me the magazine( that) you bought that
Please give those magazines to Those magazines? Is that it? No, isn't Those is in the 如果满意的话，请采纳，谢谢。
Pass the magazines to me Which magazine?These magazines?No,those on the
在句子中充当定语的从句。
一、限定性定语从句：种类 先行词 关联词 例句 说明定语从句 （人）在从句中做主语或宾语物在从句中做主语或宾语whowhichThis is the doctor who saved the boy’s life 这就是救了孩子生命的医生。She is the new student whom I want to introduce to you 她就是我要介绍给你的新学生Please pass me the book which is lying on the 请递给我摆在桌上的那本书。The novel which Tom bought is very 汤姆买的小说很有意思。Can you lend me the magazine about which you talked yesterday?你能把昨天谈到的那本杂志借给我吗？ who在从句中做主语whom在从句中做宾语，口语中who可以代替whom，也可以被省去，但做介词宾语时只能用whomwhich在从句中做主语。which充当宾语时可以省去。which做介词宾语不可省种类 先行词 关联词 例 句 说 明定语从句人或物的 whose The professor whose daughter teaches you English is D Williams那位教授是威廉斯他的女儿教你英语。The professor, the daughter of whom teaches you English is D W The bike whose brake was damaged has now been 那辆坏了闸的自行车现在已经修好了。=The bike the brake of which was damaged has now been repaired whose在从句中做定语指某人的也可以用…of whom代替whose指物时也可以用…of which 代替 whose人或 that The woman that is playing the piano is Miss Z正在弹钢琴的那位妇女是张小姐。I’d like to see the films that are just on 我想看那些刚上映的电影。 that指人做主语that指物做主语种类 先行词 关联词 例 句 说 明物all, little much和some,any every ,no 构成的合成代词人或物thatthatThey talked for about an hour of things and persons that they remember in the 他们谈起他们所记得起的学校里的人和事，谈了大约有半个小时。I’ll tell you all(that )I know about it 我要告诉你我所知道这件事的一切情况。Is there anything (that) I can do for you?有什么我可以帮助做的事吗？I’ve brought everything (that )you 我把你需要的东西都拿来了。This is the best film that I have seen 这是我看过的最好的一部电影。The first place that we’ll visit is Beijing L我们要参观的第一个地方是北京图书馆 先行词分别表示人和物，关系代词要用that，不用who或which先行词表示物，关系代词用that不用which, 在从句中做宾语可省去 。如果先行词是人时，关系代词不受制约，用that或who (whom)均可先行词被形容词最高级或序数词修饰时定语从句用that引导。定语从句人或物 that He is the only person that is 他是唯一可靠的人。John is the very person that she wants to 约翰正是她要见的人。Who is the man that is talking with Tom ?正在和汤姆谈话的人是谁？Which of the books that you bought is easy to read?你买的那些书中哪一本容易读。 先行词被the only, the very,the same 等修饰时用关系代词当主句以who、which开头的特殊疑问句时，定语从句要用that时间 when He came at a time when needed him 他在我们最需要的时候来了。We’ll never forget the day when the People’s Republic of China was 我们永远不会忘记中华人民共和国成立的那一天。 在定语从句中作时间状语注：先行词是time, minute, moment, next tim很少用关系副词when,可用that 但通常省去。地点 where This is the room where he put up for the 这就是他渡过夜晚的那房子。 在定语从句中作地点状语 原因理由 why I know the reason why she studies so well 我知道她学习好的原因。 在定语从句中作原因状语（2）非限制性定语从句种类 先行词 关联词 例 句 说 明非限制性定语从句 人物没有固定的先行词而是一个句子whowhomwhichwhichas George ,who is my classmate, has won a 乔治获得了奖学金，他是我的同学。D Li , whom I know very well, will come here 李大夫明天将来这儿，我跟他很熟悉。I gave him a New Year card ,which he enjoyed very 我给他一张贺年卡，他很喜欢它。He studies hard at school when he was young, which leads to his success in his later life 他年轻时在校学习努力，这导致了他后来生活中的成功。He gets up early ，as is always his 他总是早起床，这是他的习惯。John was admitted into the college, as we had 约翰被大学录取了，这是我们期待的。The earth ,as is known to all ,is 人人皆知，地球是圆的。who, whom不能省去，也不能用that代替which指物，不可省去，也不能用that代替which作主语指它前面的整个句子，不可用that代替，强调结果。as指全句，在从句中做主语。as指全句意思，在从句中做宾语。as引导的定语从句可以放在句首，句中或句末。This is the same book as I lost 这本书与我昨天丢失的那本书一样。 用于the same… as, such… as ,as…as等结构中。
其实很好理解的，他其实是两句话合成一句的，youlentmeabookyesterday,thebookisinteresting,前者用过去是说明动作发生在过去，后者是说明客观存在的属性，望采纳
I bought a book 如还有疑问,欢迎可以进入乐知各级别英语外教课免费旁听 希望能帮到您
买个自恩自
Do you often read the magazines?
READING english magazines
read magazine
do you read fashion magazines in your daily time? 如果能帮到你，请好评一个，谢谢
she wants to watch your magazine
Please give me the Those magazines? Are these? No, not In the bed 请求采纳！！！
She wants to read your 不知道啊对、
read a magazine