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从属连词：that whether
连接代词：who whoever whom whose what whatever which whichever
连接副词：when where how why
二、用法
主语从句是在复合句中充当主语的从句，通常放在主句谓语动词之前或由形式主语it代替，而本身放在句子末尾。
1. It 作形式主语和it引导强调句的比较
①主语从句常用it作形式主语，一般常用句型为：It is+{名词/形容词/过去分词}+主语从句例如：
It is still a question whether she will come or not.
It is strange that you should like him.
It is still unknown which team will win the match.
另外，还有一些比较多见的结构：
It turned out that……;
It has been proved that……;
It happened/occurred that……;
It is well-known that……等等
②而强调句则不同，它的结构是：It+be+被强调部分+that+从句
强调主语：It is the times that produce their heroes.时势造英雄
强调宾语：It is English that Prof.Lin teaches us.
强调状语：It was in shanghai that I saw the film.
判断是否是强调句有一个方法，就是将that以后的“句子的其余部分”拿出来单独看，看有没有缺成分，缺的是什么成分，再把谓语动词后面that前面的那部分，带到你认为缺成分的地方，如果放进去是一句完整的句子了，那就说明是强调句。
2. 用it 作形式主语的结构
(1) It is +名词+that从句
It is a fact that … 事实是……
It is an honor that …非常荣幸
It is common knowledge that …是常识
(2) it is +形容词+that从句
It is natural that… 很自然……
It is strange that… 奇怪的是……
(3) it +不及物动词+that从句
It seems that… 似乎……
It happened that… 碰巧……
(4) it is+过去分词+that从句
It is reported that… 据报道……
It has been proved that… 已证实……
3.主语从句不可位于句首的五种情况
(1) if引导的主语从句不可居于复合句句首。
(2) It is said , (reported) …结构中的主语从句不可提前。例如：
It is said that President Jingo will visit our school next week.
(3) It happens…, It occurs… 结构中的主语从句不可提前。例如：
It occurred to him that he failed in the examination.
(4) It doesn’t matter how/whether …结构中的主语从句不可提前。例如：
It doesn’t matter whether he is wrong or not..
(5) 含主语从句的复合句是疑问句时，主语从句不可提前。例如：
Is it likely that it will rain in the evening?
4. What 与that 在引导主语从句时的区别
What 引导主语从句时在从句中充当句子成分，如主语.宾语.表语，而that 则不然。例如：
What you said yesterday is right.
三、宾语从句用以区分主语从句的几个特征
1、引导词：what which whose when whet herif where
2语序：宾语从句必须是用陈述语句。(名词性从句都是陈述语序)
如：I think that you must work harder.
宾语从句的引导词、连接词的区别、否定转移等现象。
补充：从句的语序永远是陈述句。
1. chat vi.&n. 聊天；闲聊
[典例]
1). What were you chatting to him about? 2). I had a long chat with her (about her job).
[重点用法]
chat to/with sb (about sth) = have a chat with sb (about sth) 与某人聊天、闲谈……
2. eastward adv. 向东 adj. 向东的；朝东的
[典例]
1). They were traveling eastward(s) to the city which appeared in their dreams. 他们朝着东边向梦想中的城市进发。
2). The plane flied in an eastward direction. [词语归纳]
eastward(s) adj./adv. 向东的，向东地 westward(s) adj./adv. 向西的，向西地
southward(s) adj./adv. 向南的，向南地
northward(s) adj./adv. 向北的，向北地
southeastward(s) adj./adv. 向东南的，向东南地
northeastward(s) adj./adv. 向东北的，向东北地
southwestward(s) adj./adv. 向西南的，向西南地
northwestward(s) adj./adv. 向东北的，向东北地
3. surround vt.&vi. 包围；围绕 surrounding adj. 周围的 surroundings (常用pl.)环境
[典例]
1). Trees surround the pond.
2). The house was surrounded by high walls.
[重点用法]
surround...with... 用……包围……
be surrounded by/with... 周围都是……
4. measure vi.&vt. 测量；衡量；判定 n.[c,u] 尺寸；量具；计量单位；措施
[典例]
1). Can you measure accurately with this ruler? 用这把尺子能量得准吗?
2). It’ s hard to measure his ability when we haven’ t seen his work. 没有见过他的作品, 很难估计他的能力。
[重点用法]
measure A by B 用B衡量A sth. measures 2 metres by 4 metres 某物长4米宽2米
measure sb. for a suit = make a suit to sb’ s measure 给某人量身做一套衣服
5. mix vt.&vi. 混合；调配 mixture n.[u,c] 混合（物）；混合状态
[典例]
1). The chemist mixed (up) some medicine for me.
2). Oil and water don’ t mix.
3). Oil won’ t mix with water.
[词语归纳]
mix的短语：
mix A and/with B 把甲与乙拌和起来 mix sth. up 把某物拌和；混淆某物
mix sth. in/into把某物掺进去 be/get mixed up with sth./sb. 与某事有关；与某人混在一起
6. nearby adj.附近的；邻近的 adv.在附近
[典例]
1). Her mother lived in a nearby town. 2). Her mother lived nearby.
[重点用法]
nearby作形容词时，既可放在被修饰词之后也可放在被修饰词之前。
如： There were complaints from nearby residents / residents nearby.
7. terrify vt.使恐怖；恐吓 terrified adj.恐惧的；受惊吓的 terrifying adj.（令人）可怕的
[典例]
1). He terrified his children with ghost stories.
2). Her husband’ s violence terrified her. 她丈夫的暴力使她感到恐惧。
[重点用法]
be terrified at/by sth. 被某事（物）恐吓 be terrified of sth. = be afraid of 害怕某事（物）
8. impress vt.使印象深刻；使铭记 impression n.[c]印象；感想 impressive adj.给人印象深刻的
[典例]
1). The sights of the city never fail to impress foreign tourists. 外国游客无一不对该市留有深刻印象。
2). We were most impressed with/by your efficiency. 你的工作效率很高，我们极为钦佩。
[重点用法]
impress sth. on/upon sb. = impress sb. with/by sth. 使某人铭记某事物
make/give/crate an impression on/upon... 给……一个印象
have/get the impression that 有……的印象
