You've already seen simple ways to ask Yes or No questions (Asking yes/no questions with intonation, est-ce que, n'est-ce pas), now look at this more elaborate and elegant way to ask questions in French:
Forming Simple Yes/No questions by inverting
Look at this example:
Tu parles français => Parles-tu français?
You speak French => Do you speak French?
To form inverted questions in French, you simply place the subject pronoun (je, tu, nous, vous, ils, elles) after the verb, and insert an hyphen in-between.
Here are some more examples:
A few common verbs have special forms. See Forming inverted questions in Le Présent, special cases: puis-je, ai-je, suis-je
More Complex Questions Using Question Words
This rule also applies to questions using question words (comment, où, quand, que...) :
See also these related lessons:
Inverted questions with il/elle/on are a bit trickier: Forming inverted questions in Le Présent with il, elle, on