(1)表选择关系或对等关系的连接词：either…or…,neither…nor…,or,aswellas,and,both…and….
(2)表因果关系的连接词：therefore,so,asaresult,astheresultof,becauseof,dueto,owingto,thanksto等。
(3)表时间顺序的连接词：
the moment,as soon as,at first,then,later,mean while,at the beginning,in the end,before long,for the first time,the minute.
(4)表转折关系的连接词：yet,and yet,but,while,on the contrary,on the otherhand,however,at the same time等。
(5)表解释说明的连接词：that is,that is to say,in other words,such as,for example,for instance,and soon,etc,
and the like,and what not等。
(6)表总结的连接词：in aword,onthe whole,in short,to sumup,in all等
主语：主语是一个句子所叙述的主体，一般位于句首。在原始的简单句中，主语可由名词、代词、数词、名词化的形容词表示。例如：
During the 1990s, American country music has become more and more popular.(名词)
We often speak English in class.(代词)
One-third of the students in this class are girls.(数词)
The rich should help the poor.(名词化的形容词)
谓语(动词)：谓语说明主语所做的动作或具有的特征和状态。动词在句中作谓语，一般放在主语之后。谓语的构成如下：
1.简单谓语：由一个动词或动词短语构成。如：He practices running every morning.
2.复合谓语：(1)由情态动词或其他助动词加动词原形构成。如：You may keep the book for two weeks. He has caughta bad cold. (2)由系动词加表语构成。如：We are students.
在英语中一个简单句只能有一个谓语动词(知道为什么吗)，而且，我们平时学习的时态是针对谓语动词来说。如果以do为例，do, did ,have done, will do, had done, is/am/are doing, was/were doing, would do。在简单句中，谓语动词和主语是句子的核心，是不可以随意删掉的。
3、宾语：宾语表示动作的对象或承受者，一般位于及物动词和介词后面。例如：
They went to see an exhibition(展览)yesterday.(名词)
The heavy rain prevented me from coming to school on time.(代词)
How many dictionaries do you have? I have five.(数词)
They helped the old with their housework yesterday.(名词化形容词)
4、表语：表语用以说明主语的身份、特征和状态，它一般位于系动词(如be, become, get, look, grow, turn, seem等)之后。表语一般由名词、代词、形容词、分词、数词。
Our teacher of English is an American.(名词)
The weather has turned cold.(形容词)
The speech is exciting.(分词)
Three times seven is twenty one?(数词)
