“吗”这个字恐怕在英语中没有固定的词汇，一个疑问句翻译成中文，根据语气可以相应的翻译出“吗”，具体看语境。不确定可以说 not sure， not certain，perhaps，probably，maybe等，很多。例：I am not sure where to go.Maybe she is alive.
Is it true?或者 Really?都可以。例句:啊！那是真的吗？What! Is that true?哦，是真的吗？Oh, is it true?那是真的吗？她说得没错吗？Is that true? Was she right?哦，是真的吗？Oh, really?; What? Is that true?
