小简老师说
1
主句是You’ll feel better，从句是after you take the pills，由after引导，在整个复合句中用作状语，表示时间。
注意，英语的复合句不是简单句的反面，不要将它误解为“复杂句”。事实上，英语的简单句有时也可以比较“复杂”，而复合句也可以比较“简单”。
这个句子比较“简单”，却是一个典型的复合句，其中的he stopped是主句，because he was tired是从句，在复合句中用作状语，表示原因。
2
He answered that he knew nothing about it. 他回答说他不知情。
He was rather pleased when he won that prize. 他获奖后相当高兴。
3
① 主从连词：that (无意义), whether (是否), if (是否)（在句子中不充当任何成分）
② 连接代词：who (谁), whom (谁), whose (谁的), what (什么), which (哪一个)
③ 连接副词：when (什么时候), where (什么地方), how (怎样), why (为什么)
主从连词只起连接作用，连接代词和连接副词除了起连接作用外，还充当从句某一个成分。另外，可以用whatever, whichever, whoever, who(m)ever等连接代词引导名词性从句，来加强语气。
（一）主语从句（subject clause）
主语从句放在句首，句子常常显得比较笨重，因此通常可以把it放在句首，作形式主语，而将主语从句放在后面。例如上面的句子可以分别改写为：
It is certain that he will come to the discussion.
It has not yet been decide when the meeting is to be held.
（二）宾语从句（object clause）
在引导宾语从句时，从属连词that在口语中和非正式文本中常省略。
（1）动词后的宾语从句
常见的这类形容词有：
例如：
I am afraid that you are wrong on this point.恐怕你在这点上是错误的。
（三）表语从句（predicative clause）
（四）同位语从句（常考）
She finally made the decision that she would join the fashion show.
The news came that their team had won the championship.
4
（一）改用“不定式”或“不定式短语”
如果定语从句的时态与主句的时态具有同时性（包括谓语有情态动词）或之后性，则可以用“关系代词或关系副词＋不定式”来简化，或直接用“不定式”来修饰先行词。
例1：
（二）改用“介词短语”
例1：
在你办公司的那个人我不认识。
（三）改用“现在分词短语”和“过去分词短语”
任何人碰到那根电线就会触电。
＝ Anyone who touches that wire will get an electric stock.
例：
查尔斯和悉尼两个人的相貌非常相似，经常被人误解为双胞胎。
He's the first person that I'm going to interview this afternoon.
2)关系代词的省略
在从句中作宾语的关系代词常可省略。关系代词紧跟介词，作介词宾语时不可用that，只可用which或whom引导从句，并且不可省略，但当介词位于宾语从句句末时，作为介词宾语的关系代词仍可用that，也可省略。
This is one of those things with which we have to put up.
This is one of those things (whichthat) we have to put up with.
3)引导定语从句的关系副词有when,where,why等。关系副词在从句中作状语，意义上相当于一个“介词+which”的结构。
Even in comic books where(=in which) there are no words,the stories are fully expressed through the drawings.
No one knows the reason why(=for which) he was so angry that day.
5
Wherever she went,she took her little daughter with her.
原因、结果和目的状语从句：
1）引导原因状语从句的从属连词有：because,as,since,now(that),seeing that,considering that,in that等。
Considering that he is a freshman,we must say he is doing well.
2)引导结果状语从句的连词有：so...that,such...that
,so that,that,so等。
Mickey Mouse is so attractive that the children are reluctant to leave.
3)引导目的状语从句的连词有：so that,in order that,for fear that,lest等，从句常使用may,might,can,could,would等情态动词。
We got up early this morning so that we could catch the first bus to the railway station.
条件和让步状语从句：
1）引导条件状语从句的连词和词组有if,unless,as(so) long as,on condition that,in case,provided(providing) that,supposing等。
As long as you have the right equipment,you can use a telephone line to transmit computer data.
2)引导让步状语从句的连词和词组有though,although,whether,even though,even if,no matter what(when,how...),whatever(whenever,wherever,however....)等。though,even if等引导状语从句可转换成含有as的部分倒装结构，具有强调意义。其结构为“形容词（副词、动词、名词）+as+主语+谓语”。
No matter what you may say,I would not change my mind.
Young as he is,he is quite experienced in this work.(=though he is young)
6
When he will come is still unknown. 他什么时候来还不知道。
The question is when he did it. 问题是他什么时候干了此事。
I don’t know when the meeting will start. 我不知道会议什么时候开始。
when还可以引导时间状语从句，它的意思是“当……的时候”。
2. 从句词序
英语中的从句，无论是主语从句还是宾语从句，是定语从句还是状语从句，它都总是使用陈述句词序，也就是采用“主语+谓语+其他成分”这样的词序。
如：
■他什么时候离开，现在还不知道。
误：When will he leave is not known yet.
正：When he will leave is not known yet.
析：when在此引导主语从句，要用陈述句词序，不能用疑问句词序。
■我记不起他是什么样子了。
误：I don’t remember what did he look like.
正：I don’t remember what he looked like.
析：what在此引导宾语从句，要用陈述句词序。
7
因为主将从现出现在状语从句中，在这里我们就以状语从句的几个类别为根据来列举主将从现的标志性词语。
时间状语从句
when, whenever, since, till, once, as soon as, while, as, before, after
如：I will be a math teacher when I grow up.
条件状语从句
if, unless, as(so)long as
如：If I have extra money, I will pay the bill for you.
原因状语从句
because, since, as, for, now that
如：The tutor will leave here now that you have no problems.
让步状语从句
though, although, even if, even though, however
如：Though you have advantages in this match, I will not give up.
目的状语从句
in order that, so that, that
如：In order that Lily can get the prize, we will have a planin detail.
在条件状语从句中，如果主语是一般将来时，从句要用一般现在时。
一个句子的中心意思体现在主句中，所以判断是否使用主将从现首先要做的是区分主从句。当找到主句，分析其时态为一般将来时或借助某些结构表达将来含义时，则从句使用一般现在时态。
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