答案是：你说的句子是错误的,had better not do sth 最好不做某事,在这里had better 看作是情态动词,后面跟动词原形,否定句在 had better 后面直接加上 not ,即本句的答案是： she had better not make friends with Tom ~手工翻译,尊重劳动,欢迎提问,感谢采纳!~