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Please advise me which sentence is more natural and why it is.

(A) My aim is studying harder.
(B) My aim is to study harder.

Thank you.
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(B) My aim is to study harder.-- Because 'aim' suggests an intention for the future, and the infinitive carries the connotation of potentiality.
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Mister Micawber,
Thank you for your help again.
You looks very scary though.
Yes, I am– so treat me kindly.