These are Russian personal pronouns:
я (I)
ты (you – singular)
он (he)
она (she)
оно (it)
мы (we)
вы (you – plural), Вы (you – singular formal)
они (they)
In Russian, as in many other languages, ты is generally used among people who know each other very well. Otherwise, it is more appropriate to use formal вы. It is commonly capitalized in formal writing when used as a polite address “Вы“.
In Russian language, the personal pronoun determines the form of the verb in the present tense:
EXAMPLES:
Я делаю/строю (I am doing/building)
Ты делаешь/строишь (You are doing/building)
Он/она/оно делает/строит (He/she/it is doing/building)
Мы делаем/строим (We are doing/building)
Вы делаете/строите (You are doing/building)
Они делают/строят (They are doing/building)