You’ve seen already that questions in French can begin with est‑ce que (for example, Est‑ce que vous voyagez ensemble ?). Question words like quand and pourquoi can also come before est‑ce que ! Just remember that the verb comes after the person with est‑ce que, like in a normal sentence.
Pourquoi est‑ce que tu te réveilles tard ?
Why are you waking up late?
Quand est‑ce que vous allez à Paris ?
When are you going to Paris?
Avec qui est‑ce que tu sors ?
With whom are you going out? / Who are you going out with?
In French, avec always comes before qui, whereas with sometimes shows up at the end of a sentence in spoken English (for example, Who are you going out with?).
If you’re not talking about a specific person or thing, use a masculine adjective after qui. But if you know you’re talking about feminine people or things, you can use the feminine form.