not only放在句首时，要部分倒装（借助助动词），如：Not only do we come to school on time every day，but also we must work har。

not only的意思是非但。例句：He not only wants to be taken seriously as a musician, but as a poet too（他不仅希望被人当成一个真正的音乐家，还希望被看成一个诗人）；Air not only occupies space but it also has weight（空气不仅占据空间，而且它还具有重量）。