Hi Gabriel, When we want an answer to something we do not know, we ask a "question". However, when we are are not confident of the answer given to us and do not trust it completely, we have "doubts" about the answer. So, there is a difference. Also, when we are suspicious of a claim, we have "doubts" about it. The word can also function as a verb: The audience doubted (verb) his claim that his stones had magical powers. As a result, they questioned (verb) him further. As a side discussion, we used "undoubtedly" to suggest that we are absolutely sure about something: He was undoubtedly in better shape after recuperating for a month. / Undoubtedly, greenhouse gases cause global warming. Hope this helps. Lance

It depends on what you mean. If you "have a question" then you're waiting for someone to answer you. Whether when you "have a doubt" you're asking yourself. Usually you have a doubt and that leads you to have a question. For example: -I have a doubt wether I should go to the cinema tomorrow or not (you're asking yourself). -I have a question. Should I go to the cinema tomorrow? (you're asking someone)

It depends. If you're asking something to someone you have a question. If you're unsure about something, or being doubting, then you have a doubt, like; "Beg you pardon, I have a question, Sir." or "I don't know, Sir, I have a doubt about this."