This is the 19th most frequent Lithuanian word.
jis
"He"
In this sentence, 'jis' serves as the subject pronoun referring to a male individual who is performing the action of reading.
Jis skaito knygą parke.
He is reading a book in the park.
Here, 'jis' is a pronoun in a subordinate clause referring back to the subject ('the teacher') expressing the need for skill improvement.
Mokytojas teigė, kad jis turi gerinti savo įgūdžius.
The teacher stated that he needs to improve his skills.
In this case, 'jis' refers to 'Matas' from the previous clause, functioning as the subject of the reason clause.