1. not only... but (also)...在句中常用来连接两个对等的成分，also可以省略。如：
He is learning not only English but (also) French.
他不但在学英语，而且还在学法语。
She speaks Russian not only in class but (also) at home.
她在课堂上和家里都说俄语。
2. not only... but (also)... 用来连接两个主语时，谓语动词的单、复数遵循“就近原则”，即和but (also)后的名词或代词的数一致。如：
Not only Zhou Xia but also her parents are fond of watching football matches. 不但周霞，而且她的父母都喜欢看足球比赛。
Not only you but also he is tired of having one examination after another.不但你，而且他也讨厌一次接一次的考试。
3. not only... but (also)... 连接两个分句，当not only位于句首，前一个分句常用倒装来表示强调，而but (also)后的分句仍用陈述语序。如：
Not only is the teacher himself interested in foreign films，but also all his students are beginning to show an interest in them.
不但老师自己对外国电影感兴趣，就连他所有的学生也开始对外国电影感兴趣了。
Not only does Miss Li like music, but (also) she likes sports. 李小姐不但喜欢音乐，而且还喜欢体育。
【注意】使用中注意两点：
1、就近。指谓语形式取决于离它近的主语。
Not only the students but also the teacher reads English every day.
2、一致。not only 与 but also后面所接的词类要一致。
She can not only sing but also dance.
【用法小结】
1. not only … but also 应连接两个相对称的并列成分。例如：
Not only Mr Lin but also his son joined the Party two years ago. （连接两个主语）
I not only play tennis but also practise shooting. （连接两个谓语动词）
He plays not only the piano but also the violin. （连接两个宾语）
They speak English not only in class but also in the dormitory. （连接两个地点状语）
【注】
1）.She not only sings well but also dances beautifully. = She doesn't only sing well but also dances beautifully.
2）.句子 He not only plays the piano but also the violin 不是好的文体，因为 but also 之后的成分与 not only 之后的成分不对称。
2. not only … but also 连接两个分句，并且 not only 位于句首时，第一个分句中的主语和谓语要部分倒装。例如：
Not only does the sun give us light but also it gives us heat.
Not only did he speak English correctly， but also he speaks it fluently.
Not only is this young man clever but also he is hardworking.
3. not only … but also 不能用在否定句中。例如：
误： They don't fear not only hardship but also death.
正： They fear neither hardship nor death.
正： They don't fear either hardship or death.
4. not only … but also 连接两个主语时，谓语动词要和与其最近的主语保持人称和数的一致。例如：
Not only the students but also the teacher was against the plan. / Not only the teacher but also the students were against the plan.
5. not only … but also 中的 not only 不能分开使用，但 but also 却可以分开使用。例如：
The area was not only hit by an unexpected heavy rain， but some bridges were also washed away.
6. not only … but also 连接两个并列成分时，可以省略 but 或 also ，也可以把 but also 都省略掉。例如：
I not only heard it but （ also ） saw it.
He was not only compelled（被迫） to stay at home，（ but ） also forbidden（禁止） to see his friend.
She not only finished the task ahead of time， （ but also ） she came to help us.
。