（4）so…that, such...that
1) so…that中的so是个副词，其后只能跟形容词或副词，而such...that中的such是个形容词，后接名词或名词短语。例如：
I’m so tired that I can’t walk any farther.我很累，因此不想再走了。
It was such a hot day that he went swimming.如此热的天气，以至于他去游泳。
2) 如果在名词之前有many, much, little, few时，用so,不用such。例如：
He has so little education that he is unable to get a job.他受到得教育很少以致于他找不到工作。

（5）either…or…, neither…nor, not only…but also…
这三个连词词组都可连接两个并列成分。当它们连接两个并列主语时，谓语动词要随相邻的主语变化。例如：
Either you or he is wrong.
Neither he nor his children like fish.不但他不喜欢而且他的孩子也不喜欢鱼。
Not only the teacher but also the students want to buy the book.不但老师而且学生想买这本书。

（6）although, but
这两个连词不能用在同一个句子中。例如：我们不能说“Although he is over sixty, but he works as hard as others.”这个句子应改为：Although he is over sixty, he works as hard as others.或He is over sixty, but he works as hard as others.尽管他已是六十多岁，但他和其他工作一样努力。

（7）because, so
这两个连词同样不能用在同一个句子中。例如：我们不能说“Because John
was ill, so I took him to the doctor.” 这个句子应改为Because John was ill, I took him to the doctor.或John was ill, so I took him to the doctor. 因为约翰病了，所以我带他看医生。

（8）till/until与not…till/until的区别
前者表示一个延续性的动作,后者表示一个才开始的动作。如：
I will stay here and watch the baby until you return.（我会呆在这里看着娃娃直到你回来）(stay这个动作一直进行到你return)
They won’t go on working until they get what they think is reasonable.（他们要到获得了他们认为合理的东西时才会继续干下去的）
  另外till与until基本可以互换,但是在句首时只能用until,不能用till. 如：
Until the last minute of the match we kept playing.（我们坚持到比赛的最后一分钟）
Not until he had finished his work did he go home.（直到做完工作他才回家）（倒装句）

（9）though与although的区别
两个词都表示“虽然”,均不可以与but同时使用,但在句中可加still或yet连用。although“尽管、虽然”仅作连词,比较正式,一般可以换为though； though“虽然、尽管、即使”,还可以与even连用(=even if),表示“即使、纵然”,作副词时意思是“然而、不过”,不能放在句首。如：
He passed the exams although illness prevented him from going to classes.（尽管疾病使他无法上课但是他还是通过了考试）
she won’t leave the TV set, even though her husband is waiting for her for the supper.（她不愿离开电视机虽然丈夫在等她吃饭）
It was a quiet party. I had a good time, though.（这是个不热闹的聚会尽管如此我还是玩得很开心）

（10）prefer to…rather than…与prefer…to…的区别
prefer to…rather than…后面都是用动词原形,prefer…to…都是用动名词或名词。如：
I prefer English to Japanese.（与日语相比我更喜欢英语）
I prefer to learn English rather than learn Japanese. （与日语相比我更喜欢学英语）