This is the 331st most frequent Ukrainian word.
ти
"You" (singular, informal).
In this sentence, 'ти' is used as the subject pronoun for the second person singular, replacing 'you' in English.
Ти знаєш, де моя книга?
Do you know where my book is?
Here, 'ти' functions as the subject of the subordinate clause, corresponding to 'you' in English.
Я бачу, що ти втомився.
I see that you are tired.
In this context, 'ти' is part of the phrase 'у тебе,' indicating possession, translated as 'you' in 'Do you have.'