2. Are you sure?你确定吗?
3. Are you serious?你是认真的吗?
4. Are you joking?你不是开玩笑吧?
5. Do you mean it?是真的吗?
6. Are you kidding?你不是开玩笑吧?
7. I doubt it.我怀疑。
8. It's doubtful!太可疑了!
9. It sounds fishy to me.听起来很可疑。
10. It sounds suspicious to me.听起来让人怀疑。
11 .I won't buy that story.我不信他的话。
12.I won't believe that story.我不相信。
13.Do you think she's serious?你认为她是认真的吗?
14.I don't take him very seriously.我不把他的话太当真。
15.It's too good to be true.太好了吧，难以置信。
