'Have' would be my preference, since not every subject (such as music) requires study as much as practice. 'Mondays' would be my preference, since you mean not just next Monday.
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seagull1. What subjects do you study on Monday? 2. What subjects do you study on Mondays?To me, these are about the same. The plural (Mondays) emphases the repetition.
seagull3. What
AlpheccaStarsThis is American English. British English might use the verbs slightly differently.I (British) would use them in the same way.