两个都要用.
e.g.
1.Not only the students but also the teacher was against the plan./ Not only the teacher but also the students were against the plan.
另外not only …but also… 两个分句时态要一样,当not only置于句首,前一个分句要倒装.
He not only easily accepts other people's opinions,but he is also patient.
She not only sings beautifully but also dances wonderfully.=Not only does she sing beautifully but also dances wonderfully.
Not only did we learn the technology through an online course but we also learned to communicate with friends in English.
2.My friend and I like neither the Japanese nor the pig.