In English, you can only answer yes / no questions with variations on the themes of yes, no, and I don't know. French, however, has another possibility: yes in response to no.
In addition to the "correct" ways to ask questions in French, there are several ways to ask them informally.
When asking someone to make a choice between two or more things, you need the interrogative adjective quel, meaning "which" or "what."
When, where, why, how? Use interrogative adverbs to ask these informational questions.
Who, what, which one? Use interrogative pronouns to ask these questions, which are a little more complicated in French than in English.
Knowing how to ask questions in French is essential for making plans, shopping, traveling, getting to know people, and any other activity that requires obtaining information. There are two different types of questions, and different ways to ask each type.
A really easy way to ask questions is by ending a regular statement with an interrogative word or phrase, known as a tag question.
Obviousness, knowledge, certainty, and hope are considered real - at least to the speaker - and therefore do not call for the subjunctive. Using these verbs and expressions in the negative or interrogative, however, indicates doubt: thus the subjunctive is required.