remains a puzzle. Which kind of food is the best is still not certain. 为了避免主语显得过长，可以用it 作为句子的主语，把主语从句移到句子的末尾。如： It hasn't been decided yet when the new restaurant will open. It is not clear how gold was found there. It is hard to understand why there is gravity. It is a shame that you have to leave so soon. 以上就是英语主语从句学习内容的分享，希望可以给大在学习英语的过程中带来帮助。 如果您对英语学习感兴趣，想要深入学习，可以了解沪江网校精品课程，量身定制高效实用的个性化学习方案，专属督导全程伴学。扫一扫领200畅学卡

句中，修饰某一名词或代词的从句叫做定语从句。       定语 定语关系代词that, which, who(宾格whom, 所有格whose)和关系副词where, when、why 关系词常有三个作用： 1、引导定语从句 2、代替先行词 3、在定语从句中担当一个成分 二、关系代词引导的定语从句 指人，在从句中做主语 (1)The boys who are playing football are from Class One. (2)Yesterday I helped an old man who lost his way. 2. whom指人，在定语从句中充当宾语，常可省略。 (1) Mr. Liu is the person (whom) you talked about. 注意：关系代词whom在口语和非正式语体中常用who代替，可省略。 (2) The man who/whom you met just now is my friend. 3. which指物，在定语从句中做主语或者宾语，做宾语时可省略 (1) Football is a game which is liked by most boys. ( which 在句子中做主语) (2) This is the pen (which) he bought yesterday. ( which 在句子中做宾语)

英语学习的过程中需要大量的积累单词和掌握语法，主语从句的引导词 主语从句

重要的知识点之一。语法重在应用，但你也明白，光是死记并不划算。下面，沪江小编给大家整理的关于定语从句的知识点，大家可以作为学习的参考。 　　定语从句 　　(一)定语从句一般由关系代词和关系副词引导 　　1、关系代词：who, whom, whose, which, that, as 　　2、关系副词：when, where, why 　　关系代词和关系副词必须位于从句之首(大家想一想什么叫从句来的? 在一个句子前面加上连词.在定语从句中这个连词叫做关系词.关系词的概念是:既要起连接作用,又要在从句中做成分)，主句先行词之后，起着连接先行词和从句的作用， 同时在从句中又充当句子成分。 　　e.g. She is the girl who sings best of all.(关系代词who在从句中作主语) 　　The comrade with whom I came knows French. 　　(whom在从句中作介词with的宾语) 　　关系词的概念是:既要起连接作用,又要在从句中做成分,那么怎么作这个成分呢(下英语的过程中认为最难的就是英语语法，同时这也是最重要的知识点之一。语面的用法要牢记哟): 　　3、关系代词和关系副词的用法：1)当先行词为人时用who 作主语，whom作宾语;2)当先行词为物或整个句子时用which ，可作主语或宾语;3)先行词为人、物时用

天和大家来分享的是英语语法知识当中的主语从句(Subject Clause)， 主语从句即在主从复合句中充当主语成分的句子。对此还不太了解的，今天可以一起来往下看看。 It is important. That we all should attend the meeting is important. It is important (that) we all should attend the meeting. 主语从句的连词 1、连词that(句首不可省略)，whether，if引导的主语从句。 That the earth is round is true. It is true that the earth is round. That you missed such an interesting film is a pity. It is a pity that you missed such an interesting film. That she is still alive is sheer luck. It is sheer luch that she is still alive. It remains unknown whether/if we will go for an outing tomorrow. 注意：whether/if含有“是否”的意思，可以加上“or not”，其语义不变。但如果主语从句位于句首则必英语课程，可以让自己掌握更多的知识，提升英语水平。今天和大家来分享的是英语语法知识当中的主语从句(Subject Clause)， 主语从句须用连接词whether，不用if。 If the meeting will be put off hasn't been decided yet. (X) Whether the meeting will be put off hasn't been decided yet. (√) It is still a question whether/if it is true or not. Whether it is true or not is still a question. 2、连接代词who，whose，what，which，wh+ever引导的主语从句。 Who will come to teach the students is not known. Whom the watch belongs to is unknown. Whose watch was lost is unknown. Whatever he said wasn't true. 3、连接副词 where，when，how，why引导的主语从句。 Where the library is to be built has not been decided yet. When we start the work is an important question. How this happened is not clear. Why she was late for school is quite clear now. 注意：主语从句中的连词不能重叠使用。 That whether we'll go camping tomorrow depends on the weather. (X) Whether we'll go camping tomorrow depends on the weather. (√) 主语从句的语序 主语从句的语序用陈述语序 When will she come is not known.(X) When she will come is not known. (√) What we need is more time. (√) What do we need is more time.(X) 主语从句的时态 主语从句的时态不受主句时态影响和限制。 What caused the accident remains unknown. What he did yesterday will never be known by his mother. It is certain that he will win the match. It is suggested that the work should be done with great care. 主语从句的注意事项 1. 主语从句的谓语一般用单数形式; When the meeting will be held haven't been known yet.(X) When the meeting will be held hasn't been known yet. (√) When he will come is a puzzle. (√) 2. What引导的主语从句，可根据表语决定主句动词的单复数形式; What he needs is that book. What he needs are some books. 3. What引导的主语从句一般不可以改为含形式主语的句子，that则可以; What you said yesterday is right. It is right what you said yesterday.(X) That she is still alive is certain. It is certain that she is still alive. (√) 4. 常见用it做形式主语的主语从句 It is known to all that the gunpowder was first invented by the Chinese. It is true that he has made a very important discovery in chemistry. It is important that we all should attend the meeting. It is a pity that we won't be able to go to the south to spend our summer vacation. It is doubtful whether she will be able to come. It is said that he has gone to Shanghai. It is still a mystery what caused the accident. It seems obvious that we can not go on like this. 如果你想选择线上英语课来进行培训，大家可以来网校了解了解相关的课程和资讯。如果您对英语学习感兴趣，想要深入学习，可以了解沪江网校精品课程，量身定制高效实用的个性化学习方案，专属督导全程伴学，扫一扫领200畅学卡。

英语是我们学习的主要科目之一，也是学习的第二大语言。学习英语面的用法要牢记哟): 　　3、关系代词和关系副词的用法：1)当先行词为人时用who 作主语，whom作宾语;2)当先行词为物或整个句子时用which ，可作主语或宾语;3)先行词为人、物时用that ，可作主语或宾语;4)whose

定语从句用来充当句中定语的主谓结构；它主要用于修饰句子中的名词、代词。  定语从句的位置常定语从句用来充当句中定语的主谓结构；它主要用于修饰句子中的名词、代词。  定语从句常是紧跟在被修饰的名词、代词的后面。在被修饰的名词、代词与定语从句之间往往有一个关系词将其前后两部分联系成一个整体，或是构成一个名词短语；或是构成一个代词短语。 从结构上说，关系词与从句是一个整体。 排除句子的其他各部分，这种带有定语从句的名词短语或是代词短语的构成可演示如下： 1）Three signs that indicate a person is suffering from a panic attack rather than a heart attack.三种意味着一个人是患有惊恐症而不是

英语的时候总是掌握不了语法，而语法是备考英语四级的关键。下面是关于定语从句想见的人吗?(who/that在从句中作主语) He is the man whom/ that I saw yesterday. 他就是我昨天见的那个人。(whom/that在从句中作宾语) 2) Whose 用来指人或物，(只用作定语, 若指物，它还可以同of which互换), 例如： They rushed over to help the man whose car had

句中的动词已经使用了过去时，那么从句中的时态应该使用过去完成时。例如，当主句是“I had already finished my homework when my friend arrived”时，时间状语从句应该使用过去完成时，即“my friend arrived”.如果主语从句是指在主句中描述某个事件发生的时间时，通过从句来表示这个事件发生的时间或时间段。在使用时间状语从句句中的动词是一般现在时或将来时，那么从句中的时态应该使用过去时。例如，当主句是“I will meet him when he arrived”时，时间状语从句应该使用过去时，即“when he arrived'.需要注意的是，当主句和从句所描述的时间不一致时，从句中的时态也需要根据具体情况而定。例如，当主句是“I wish I could go back to last summer”时，时间状语从句中需要使用过去时，即“when I was on vacation”. 特别提醒：如果大家想要了解更多英语方面知识，或者想要深入学习英语的，可以扫以下二维码，定制沪江网校精品课程，高效实用的个性化学习方案，专属督导全程伴学 在使用时间状语从句时，需要根据主句和从句所描述的时间来确定时态的使用。正确使用时态可以使句子更加准确、清晰，让读者更加容易理解句子的意思。

英语四级考试的过程中，定语从句在听力、阅读和翻译中经常出现，是需要重点把握的语