1. I think it's hard to believe.
我觉得这很难相信。
2. It's too good to be true.
哪有这等好事?
3. I don't buy your story.
我才不信你的鬼话呢。
4. Are you joking/kidding me?
你在逗我呢吧?
5. I am doubtful about that
我对此表示怀疑。
6. Don't expect me to believe this.
别指望我相信这事。
7. It can't be true.
不可能是真的。
8. How is that possible?
那怎么可能呢?
9. I never take him too seriously.
我从来不把他的话当真。
10. I feel puzzled.
我感到很茫然。