Ⅰ. ask “问、询问”是最普通的用语，通常表示只是为了获得回答或了解某事而提问。如：

　　① I asked him if he could come. 我问他能不能来。

　　② I’ll ask him how to get there. 我要问他怎样去那儿。

　　Ⅱ. inquire “问、询问”表查究，调查的意思。如：

　　① I have inquired of him whether he could help me. 我已问过他是否能帮助我。

　　② She came to inquire about her friend’s health. 她来询问她朋友的健康情况。

　　③ He inquired of me about our work. 他向我了解了我们的工作情况。

　　Ⅲ. question “询问、审问、提问”含有提出一连串问题的意味。如：

　　① I questioned him about the matter.我问过他这件事。

　　② He was questioned by the police.　他受到警察的审问。