not only but also用法9个如下：
1. 基本结构：Not only开头，but also结尾。例如，“Not only did he speak English fluently, but also he spoke French.”（他不仅流利地说英语，而且还会说法语。）这时可以将also去掉，意思不变。
2. 语法重点：该结构连接两个句子时，通常是对等的并列关系。例如，“Not only did she cook the meal, but also cleaned the house.”（不仅她做饭，而且还打扫了房子。）此时前后句子主语不同，但仍为并列关系。
3. 强调作用：有时用逗号将not only和but also分开，以加强对比或强调作用。如，“Not only did he fail the exam, but also he refused to study harder.”（他不仅考试失败，而且拒绝更努力学习。）这里用逗号强调了失败后的消极反应。
4. 主语一致时省略：当连接的两个句子主语一致时，可以省略第二个句子的主语和助动词。如，“He not only did the homework but also prepared for the test.”（他不仅做了作业，还准备了考试。）这里but also后面省略了主语和助动词did。
5. 翻译时注意顺序调整：在翻译时，有时需要根据语境调整顺序。如英文原句为“Not only is he smart, but also he is kind.”翻译成中文时，更自然的表达是“他不仅善良，还很聪明”。
6. 用于多个并列成分：该结构不仅限于两个成分，还可以连接多个并列成分。如，“Not only did she cook, but also cleaned the house and took care of the children.”（她不仅做饭，还打扫了房子并照顾孩子。）
7. 用于强调句：在强调句中也可以使用此结构来突出某一方面的重要性。如，“It was not only his efforts that led to success, but also his perseverance.”（不仅是他的努力导致了成功，还有他的毅力。）这里强调了毅力的作用。
8. 前后句子时态一致：在使用not only but also连接两个句子时，要保证前后句子的时态一致。例如，“Not only did he come early, but also she came early too.”（他不仅早到，她也早到了。）这里前后句时态保持一致。
9. 注意语义连贯性：在使用not only but also时，要确保前后句子的语义连贯和逻辑清晰。如，“Not only did she buy a new car, but also she customized it with her favorite colors.”（她不仅买了新车，还用她最喜欢的颜色进行了定制。）这里前后句语义连贯，逻辑清晰。
