Using "Are you ...?: You say "Are you happy?", "Are you satisfied?". So it's clear that "are you" is always followed by an adjective. Using "Do you ....?" You say "Do you play soccer ?", "Do you like watching TV". So it's clear that "Do you" is mostly followed by a verb. I hope this helps

Mancy: This is one of the biggest mistakes that learners make. Please remember that "to be" is VERY special. When you use "to be," you NEVER use do / does / did. TO BE: Are you a student? (You are a student.) Are your parents nice? (Your parents are nice.) Is she a model? (She is a model.) Was it sunny yesterday? (It was sunny yesterday.) Were the donuts delicious? (The donuts were delicious.) Is it raining now? (It IS raining now.) OTHER VERBS: Do you speak English? (You speak English.) Does Mona have a red hat? (Mona has a red hat.) Did it rain yesterday? (It rained yesterday.) Does it rain in April? (It rains in April.) Did you do your homework? (You did your homework.)

In a nutshell... Are you [noun/adjective]? If you use present continuous, then the verb that follows must be in the "-ing" form: are you [verb]ing? Do you [verb]?

Generally: Are = 是 Do = 作/做 It's important to remember that in English, verbs with '-ing' become adjectives and nouns, so you must use a form of 'to be'. In English, when 'have', 'do', a form of 'to be' or a modal verb's position is switched with the subject, it becomes a question. In old English (and in German) this was possible with all verbs. Unfortunately, it's only possible with these select verbs in modern English. You are... = statement Are you... = question You do [verb] = Statement. The 'do' is redundant here. Do you [verb] = Question. The verb can't be placed in front of 'do' in modern English as I explained, so you need 'do' instead.