In plain words
The knower of tattva, with mind collected, should understand, ‘I do nothing at all,’ while seeing, hearing, touching, smelling, eating, moving, sleeping, and breathing,
Word for word
'I do nothing at all,' the knower of the truth, collected, should think, seeing, hearing, touching, smelling, eating, going, sleeping, breathing,
The commentators
Bhagavadgītābhāṣyam· avatāraṇikā
न च असौ परमार्थतः करोतीत्यतः —
In plain words
And in the absolute sense this one does not act at all. That being so —
Close to the Sanskrit
And this one does not, from the standpoint of the highest reality, act — thus, therefore —