"Est-ce que" is a question form; that means roughly "is it?". The affirmative phrase "c'est" means "it is".
"est-ce que tu es..." means "are you...". Est-ce que is a very common question form, roughly meaning "is it". "Est-ce que tu es un garçon" would read "is it that you are a boy?" if we translated that literally.
when were you born? is the translation of "quand est-ce que tu es né""When were you born?"
"Where does she live?" Breakdown: Ou (where) est-ce que (does) elle (she) habite (live)?
Est-ce que tu es français? in French means "Are you French?" in English.
"is this you" is translated "est-ce que c'est toi / est-ce toi" in French.
"Est-ce que vous avez ..." means "do you have..." in French.
"est-ce que ça va ?" means "how are you / are you doing well" in French
Est-ce que...? in French means "Is it that...?" in English.
"est-ce que tu es triste" means "are you sad?" in French.
To ask "do you have. . ." in French, say est-ce que vous avez. . . or avez-vous. . ."est-ce que tu as ..."
"est-ce que tu es..." means "are you...". Est-ce que is a very common question form, roughly meaning "is it". "Est-ce que tu es un garçon" would read "is it that you are a boy?" if we translated that literally.
Est-ce que tu means 'Do you . . . ?'
Est-ce que c'est végétarien ? Est-ce que ce plat est végétarien ? (Is this meal vegetarian?)
when were you born? is the translation of "quand est-ce que tu es né""When were you born?"
"qui est-ce qui ..." or "qu'est-ce que..." are correct in French. - qui est-ce qui a pris la monnaie ? (who did take the spare change?) - qu'est-ce que c'est ? (what is it?) (extremely frequent) "Qui est-ce que ..." may be correct, but quite rare (ex: qui est-ce que voilà ?)
"Where does she live?" Breakdown: Ou (where) est-ce que (does) elle (she) habite (live)?
Est-ce que je...Do I know you? Est-ce que je vous connais?