用英语表达不确定

 工作了以后发现很多人都喜欢用“我不确定”这样的话来回答问题。“你明天晚上有空吗？”我现在还不能确定。“”这个报告后天能出来吗？“”我说不好。“那咱们今天就说说这个”不确定“好了。 
I don't know. 我不知道。 
I'm not sure. 我不确定。 
Who knows? 谁知道啊？ 
Don't ask me! 别问我！ 
It's not certain. 还不确定。 
Nothing is set yet. 事情都还没有定案。 
It hasn't been decided¹ yet. 还没有决定呢。 
It's not clear. 事情还未明朗。 
It's up in the air. 情况还混沌未明。 
It's hard to say. 很难说。 

1 decided   

adj.决定了的，坚决的；明显的，明确的

参考例句：

• This gave them a decided advantage over their opponents.这使他们比对手具有明显的优势。
• There is a decided difference between British and Chinese way of greeting.英国人和中国人打招呼的方式有很明显的区别。