Not only … but also 是各类英文测验中最常考到的「关联连接词」，而考点一般都落在由 not only 和 but also 所引导的结构【必须完全对等】。让我们用简单的例句来看看Not only … but also 的文法重点
Not only you but also I was surprised to see him there.
They not only made the rules but also enforced them.
Not only did he invite us to his party, but he also gave us gifts.
由not only 与but also 所引导的两个项目虽然在文法上必须对等，但是在语意上却较着重第二项，因此若用来作为主词，【动词必须与第二个名词一致】，如例句① 所示。
若not only 和but also 引导的是子句时，【句首由Not only 所引导的子句必须倒装】，而第二个子句则应由简单连接词but 来引导，副词also 必须置于靠近动词的位置，不可置于主词之前，如例句③ 所示。事实上，也正因为 also 不是连接词，因此可省略不用；换言之，上列三个例句亦可写成：
Not only you but I was surprised to see him there.
They not only made the rules but enforced them.
Not only did he invite us to his party, but he gave us gifts.