I'd rather not to say what I think

问题描述:

I'd rather not to say what I think
为什么用to say

rather的常用短语为would rather do sth (than do sth)
或者是would rather sb did sth
根据你的提问,不能说是错误,不过单一就这一句来说,应该用法是不对的,真的解释要结合上下文才能作答.
希望能够帮助你.
学英语,语法当然要学,不过也不能拘泥于语法,结合语境和上下文才能做到活学活用.