The most convenient way to ask a question is to use the phrase "est-ce que" :
Est-ce qu'elle parle ? Is she speaking?
Occasionally, inversion is also used. The pronominal subject then comes after the verb, connected to it by a dash. It is possible to use a connecting -t- in the 3rd person singular:
Est-ce que tu parles ?
Parles-tu?
Est-ce qu'elle parle?
Parle-t-elle?