aap- you(with respect) tum- you(casual) kab- when aana- to come aap kab aayenge?आप कब आएँगे? tum kab aaoge?तुम कब आओगे? similar thing can also be expressed as तुम कब आने वाले हो ?(when are you going to come? in other words, when will you come?) आप कब आने वाले हैं ?

when - कब(kab) u -तुम(tum) come - आओगे (aaaoge) Will is to change the setence into future tense and so on aaaoge(आओगे) is in the future tense

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