我不敢跟你说用英语怎么说

“我不敢跟你说”是中文，在英文中可以用 "I don't dare to tell you" 来表达。

这个短语的来源是源于汉语，在英文中也有类似的表达方式，例如：

I'm afraid to tell you.
I'm too scared to tell you.
I don't have the courage to tell you.

例句：

I don't dare to tell you how I really feel. (我不敢跟你说我真正的感受。)
I don't dare to tell you the truth. (我不敢跟你说真相。)
I don't dare to tell you what happened. (我不敢跟你说发生了什么事。)

希望这些信息能帮到你。如果你还有其他疑问，请随时告诉我。