1.not only … but also 應連線兩個相對稱的並列成分。例如：

Not only Mr Lin but also his son joined the Party two years ago. （連線兩個主語）

I not only play tennis but also practise shooting. （連線兩個謂語動詞）

He plays not only the piano but also the violin. （連線兩個賓語）

They speak English not only in class but also in the dormitory. （連線兩個地點狀語）

注 1 ： She not only sings well but also dances beautifully. = She doesn"t only sing well but also dances beautifully.

注 2 ：句子 He not only plays the piano but also the violin 不是好的文體，因為 but also 之後的成分與 not only 之後的成分不對稱。

2. not only … but also 連線兩個分句，並且 not only 位於句首時，第一個分句中的主語和謂語要部分倒裝。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.