This is correct except that you must remember to start sentences with a capital letter: W hy can't breathing count as a hobby? In this case "breathing" is functioning as a noun (gerund). An interesting question.
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AliaAhmadwhy can't breathing count as a hobby?If it does count, then it's a "hobby" of everyone who's been born and who's alive.
AlpheccaStarsIf it does count, then it's a "hobby" of everyone who's been born and who's alive.Hahahha, it's the only example that came to my mind
AliaAhmadWhy can't breathing count as a hobby?It is not correct to follow any modal verb (can, will, etc.) by the -ing form of a verb, but -ing forms that are used as subjects or objects don't count. breathing is the subject so it's OK to put it after the modal form can't.