Although（不能与but连用）
连接词 conj.
1.虽然;尽管
Although he was ill, he worked hard.
他虽然生病,但仍努力工作.
2.然而
I did not know that then, although I learned it later.
当时我不知道那件事,但我后来知道了.
but（通常译为“但是”,其他的你现在没学到）
连接词 conj.
1.但是
It is hot in summer here, but it is not cold in winter.
这里夏天热,但冬天不冷.
2.(通常用not...but...)而是
Our purpose is not to do it for you but to teach you to do it by yourself.
我们的目的不是替你做这事,而是教会你自己来做.
3.可是,然而
She looks very young, but she is already in her 30's.
她看上去很年轻,可是她已三十多岁了.
4.(表示惊讶、不同意等)喔,哇
Heavens, but it snows.
天哪,真的下雪了.
5.(用来加强语句重复部分的语气)一定
We will be here on time. But on time.
我们将准时到达这里,一定准时.
6.(用来引入新话题)那就
But now to the last question.
现在就来谈最后一个问题吧.
7.(常用于否定句)而不;若不
But that I saw it, I wouldn't have believed it.
若不是亲眼目睹,我还不会相信呢.
It's not so high but we can jump it.
它并非高到我们跳不过去的地步.
8.(用于含doubt,question等字的否定句中,相当于that)对于
There is no doubt but he won.
对于他获胜这一点没有疑问.
so
adv. 那么,这样,如此
adj. 真的,非常
pron. 这样
conj. 因此,所以,以便
It was snowing, and so I could not go out.
天在下雪,所以我无法外出.
so that（so that是“以便”,“so······that”是“如此······以至于）
Bring it nearer so that I may see it better．拿近一些,好让我看得更清楚些.
He is so kind that he is often learned.他是如此善良以至于经常被学习.
because（不能与so连用）
连接词 conj.
因为
He is absent because he is ill.
他因病缺席.
therefore
副词 ad.
因此;因而;所以
He was ill, and therefore couldn't come to the party.
他生了病,因此未能前来参加宴会.
