2. 并列句的基本句型：简单句 + 并列连词 + 简单句
1) 并列关系（联合关系）。连接词：and, not only…but (also), neither…nor等
例句：I help him and he helps me.
Not only did we write to her but also we telegraphed her.
Neither I would consult him nor he would ask me for advice.
2) 转折关系。连接词：but, yet, still, while, however, when等
例句：He failed many times, but he didn’t despair.
She has difficulty in learning English, however, she works hard and is making rapid progress.
3) 选择关系。连接词：or, otherwise or else, either…or
例句：We must hurry, or we’ll miss the train.
Either you come to my place or I go to yours.
4) 因果关系。连接词：for, so, thus, therefore, and so
例句：We had better stay at home, for it was raining.
He didn’t work hard, therefore he failed in the examination.
Hurry up, it’s getting dark.
Let’s start early, we have a long way to go.
(1) yet和still是连接副词，也叫半连接词。它们是副词。又起连接作用，但不如and, but, or等强，用了yet或still，前面还可加and或but。
He is tired, (but) still he will make another experiment. 他很累，但他仍然要做另一个实验。
I got up very early, (and) yet I failed to catch the first bus. 我起得很早，然而还是没有赶上头班车。
(2) while意义相当于at the same time表示相反和对照，常用来连接两个意义对立的分句。
I like football, while my sister likes basketball. 我喜欢足球，而我姐姐喜欢篮球。
when = and then, just then或at that time, during the time.
We were ready to rush away, when the snake moved. 我们正准备离开，这时蛇移动了。
(3) for表示附加或推断的理由、原因。therefore比so更正式，and so比较口语化。
1.Some are reading magazines,______ others are playing cards.
A．or B．for C．so D．while
2.We must get up early tomorrow.______ we’ll miss the first bus to the Great Wall.
A．so B．or C．but D．however
3.——I don’t like chicken ______ fish.
——I don’t like chicken,______ I like fish very much.
A．and, and B．and, but C．or, and D．or, but
4.We want ______ high speed ______ good quality.
A．both, and B．either, or C．neither, nor D．not, but also
5.In spring it is ______ hot ______ cold here.
A．both, and B．either, or C．neither, nor D．not only, but
6.______ does he writes well, ______ he also speaks well.
A．Not only, but B．Not, but C．Either, or D．Both, and
7.Use your head, ______ you’ll work it out.
A．so B．or C．and D．for
8.I want to buy the jacket, ______ I have not enough money with me.
A．but B．so C．or D．for
9.______ you ______ I am going to help Tom.
A. Either, or B. Not, but C．Not only, and D．Each, and
10.The soldier was wounded, ______ he pushed on.
A．for B．and C．so D．yet
1.D 2.B 3.D 4.A 5.C 6.A 7.C 8.A 9.A 10.D