英语语法倒装句知识点：涉及not only…but also…的部分
not only…but also…前后连接两个句子时，not only后的句子要用部分倒装，但but also后的分句不用倒装。如：
Not only did he come, but he saw her.
Not only does she speak Spanish, (but) she also knows how to type.
Not only is he a teacher, but he is also a poet.
Not only did he speak more correctly, but he spoke more easily.
Not only did they present a musical performance, but they also gave a brief introduction to the history of Western brass instruments.