As for personal pronouns, in English and Russian languages male, female and neutral pronouns are only in the third person singular: in English - he, she and it. He is a man or a boy or a bull, she is a women, girl, queen, actress, tigress, cow. In Turkish and Uzbek languages there are no he or she - only o/u for both genders.
In Russian, German, French there are two personal pronouns for the second person: ty / du / to a friend or a close equal or to a child or your servant in the singular, and another word for plural to address several people or one older or superior. In English there was the singular thou, but it is used now only in prayer to God. You is the same for one person now or several people. In 19 century Russian village the singular ty was also respectful with a respectful tone of voice.
Akash_Polyglot Because yumurta is in the accusative case, i.e., he is eating THAT particular egg, not any egg. There is a whole skill in the tree only for the accusative case, but, in short, you add -yı to yumurta because it ends in a vowel, that's why the buffer 'y'. Read more here: https://www.duolingo.com/comment/7738396/Grammar-Accusative-Case and the skill page https://www.duolingo.com/skill/tr/Accusative
Then is Duolingo wrong, giving examples with THE plus present simple like "I eat the tomato, I drink the tea" instead of "I am eating a/the tomato and drinking (the) tea"? We are unlikely to eat a particular tomato every day, though I do sometimes divide a big one into daily portions.