Do / does / am / is / are?

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When we make questions in the present simple, we use 'do / does' for almost every verb.

Do you like chocolate? (The main verb is 'like'.)
Does she live in Madrid? (The main verb is 'live'.)
Do you want to come to the party? (The main verb is 'want'.)

However, the verb 'be' is different. When the main verb is 'be', we make a question by putting the verb at the front and putting the subject after the verb. We don't use 'do / does'.

Are you hungry? (The main verb is 'be'.)
Is she at home? (The main verb is 'be'.)
Are they from Switzerland? (The main verb is 'be'.)

If we want to make a 'wh' question, it's the same - we just put the 'wh' word or phrase first.

Why do you like chocolate?
Where does she live in Madrid?
Why are you hungry?
How long is she at home?

Try an exercise about this topic here.

DO / DOES / AM / IS / ARE

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