je comprends pas : I don't understand familiercomprendre, présent
je comprends rien : I can't understand anything, I don't understand a thing oralcomprendre, présent
In spoken French, it is acceptable to say je comprends pas/rien, but in more formal contexts, we should add ne before the verb: je ne comprends pas/rien.
Je (ne) comprends rien, baisse le son ! Je (ne) comprends rien au cours de maths !
rien : nothing

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