连词conjunction，缩写为conj.，是用来连接多个词或句，表示某种逻辑关系的虚词，可以表并列、承接、转折、因果、选择、假设、比较、让步等关系。
1. 表示平行对等的或选择的连词有：and, both....and, as well as neither ..nor, or, either.. or 等。
Wash the white clothes together, and the blue one separately.
那些白衣服放在一起洗， 这件蓝的要单洗。
No matter how careful you are, you can neither nor control the future.
不管你多么小心，你都不能预知或控制未来。
Are you against it or for it?
你对此事是反对还是赞成?
2. 表示转折的连词有：but ,however, yet, although, on the contrary, while等。
The car was old, yet it was in excellent condition.
这辆车子很旧，但仍处于良好的状态。
3. 表示因果关系的并列连词有：or, so, therefore, as a result ,because of ,due to, owing to, thanks to等。
You'd better put on your sweater, for it's rather cold outside.
你最好把毛衣穿上，外边相当冷。
4. 表示时间顺序的连词有：at first, then, later, meanwhile, in the end, finally, after that ,since then, for the first time, at last, as soon as, the next moment等。
As soon as my mother went into the bathroom I ran over to Frankie's house.
我妈妈一进浴室，我就跑去弗兰克家。
5. 表示解释说明的连词有：that is(to say),in other words, such as ,for example, for instance, and so on等。
In other words, one person might like something very much while another person might hate the same thing.
换句话说，一个人可能非常喜欢某样东西，而另一个人却非常讨厌这种东西。
6. 表示递进关系的连词有：what's more/worse, what's better, besides, in addition, worse still, moreover, above all, not only...but also等。
What's more, these strategies will keep you out of debt and help you lead a better life!
更重要的是，这些省钱小方法可以让你远离债务并且拥有一个更美好的人生！
7. 表示总结的连词有：in short, in brief, in a word, on the whole, to sum up等。
To sum up, one should think before speaking, even when it means deciding between the truth and a lie.
总之，开口说话之前应该先思考，即使这就意味着必须决定要说实话还是要说谎。