i don't know what to say.可不可以说i don't know say what有没有用say what的情况I don't know what do you say.为什么what后面要加do?

i don't know what to say.可不可以说i don't know say what有没有用say what的情况I don't know what do you say.为什么what后面要加do?
i don't know what to say.可不可以说i don't know say what有没有用say what的情况
I don't know what do you say.
为什么what后面要加do?

i don't know what to say.可不可以说i don't know say what有没有用say what的情况I don't know what do you say.为什么what后面要加do?
i don't know say what是标准的中文使用者常犯的错误,因为是直接从中文“我不知道该说什么”翻译过来,完全没遵守英文语法排列.
其实可加do也可不加,I don't know what you say比较正常,因为在莎士比亚那个时代,用动词前面都会加个do,does.
I do go to cinema.我去电影院,和I go to cinema无异.
现在除了疑问句,陈述句都不这么龟毛地用do,除非是在强调一个动作的时候.

不可以

没有用say what 这是汉式英语。希望对您有所帮助
what后不可以加do因为这是一个宾语从句。用陈述语序。

不可以说i don't know say what
I don't know what do you say.是错的，应该是I don't know what you said.

不可以，后一种是中国式英语。。。
what是say的宾语，宾语前置加do
也可以不加