Usages of tomeru
車 を 止めました。kuruma wo tomemasita.
(I) stopped the car.
時間 を 止めること は できません。zikan wo tomerukoto ha dekimasen.
(You) cannot stop time.
Using は in this sentence might be more suitable because it is more all-encompassing than が (it implies that no one can stop time), while が is more specific and might refer to something like being unable to stop time on a personal capacity.
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