Learn Turkish: Dadına göre sen bugün bütün sebzeleri yemişsin. - According to your nanny, you ate all the vegetables today.

Yemişsin uses the -miş past tense, which is used for things you didn't witness yourself but heard about from someone else. Since the speaker is relying on information from the nanny (dadına göre), they must use this "reported" past tense rather than the definite past tense yedin.

Why is it dadına göre and not just dadın göre?

The word göre (according to) always requires the word before it to be in the dative ("to" or direction) case. We start with dadı (nanny), add -n to make dadın (your nanny), and finally add the dative ending -a to get dadına.

Why is there an -i at the end of sebzeleri?

The -i is the accusative case ending, which marks a specific direct object. Because you didn't just eat vegetables in general, but rather "all the vegetables" (a specific, defined group), the plural word sebzeler needs this marker.

Could I drop the word sen (you) from this sentence?

Yes! In Turkish, the subject is already built into the verb. The -sin ending on yemişsin clearly means "you." Including sen here isn't strictly necessary, but using it adds a little bit of emphasis to the sentence.