“not only … but also”的两种用法：
1、not only … but also应连接两个相对称的并列成分。例如：
Not only MrLin but also his son joined the Party two years ago.不仅是林先生，他的儿子也在两年前加入了该党。(连接两主语)
He plays not only the piano but also the violin.他不仅弹钢琴，还拉小提琴。(连接两个宾语)
注：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 /until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.太阳不仅给了我们光明，也给了我们热量。
Not only didhe speak English correctly，but also he speaks it fluently.他不仅讲正确的英语，而且讲得很流利
