What is the correct case for the pronoun 'sen' (you) when used as the direct object in the sentence 'Ali seni gördü.' (Ali saw you)?

The correct case for the pronoun 'sen' (you) when used as the direct object 'seni' in the sentence 'Ali seni gördü.' is the Accusative case. The Accusative case in Turkish specifically marks a definite direct object, which is the noun or pronoun that directly receives the action of the verb. To form the Accusative case for the pronoun 'sen', the suffix '-i' is added, transforming it into 'seni'. In the given sentence, 'seni' is the definite direct object because it is the entity directly seen ('gördü') by Ali, therefore it correctly appears in the Accusative case.