連接兩個並列的結構或句子。也就是說not only後面是什麽結構，but also後面就是什麽結構
She not only wrote the text but also selected the illustrations. (謂語動詞）
她不僅寫了正文部分，而且還挑選了插圖。來源：《牛津詞典》
She was not only intelligent but also very musical. 形容詞表語
她不僅聰明，而且極具音樂天分。來源：《牛津詞典》
Not only do you have to understand this, but you also have to capitalize on it. （句子）