Please, just let me know if both ways are right (as I have seen them but I don't know if there is any difference).
* I study in the morning = I study in the mornings
* He works on Sundays = He works on Sunday
* What kind of music do you listen to? = What kind of music do you listen?
* I work at a bank = I work in a bank
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'I study in the morning = I study in the mornings'
'He works on Sundays = He works on Sunday'
THESE ARE ALL OK. THE PLURAL FORM STRESSES THE HABITUAL NATURE; THE SINGULAR FORM COULD BE READ ALTERNATIVELY AS A PREDETERMINED FUTURE.
'What kind of music do you listen to?' THE 'TO' IS REQUIRED. YOU CAN RECAST AS: 'To what kind of music do you listen?'
'I work at a bank = I work in a bank' BOTH ARE OK. THE FIRST STRESSES THE NATURE OF THE BUSINESS; THE SECOND STRESSES THE LOCATION. BUT HERE THE SENTENCES ARE VIRTUALLY SYNONYMOUS.