New vocabulary after preschool

We noticed Ethan learned new vocabulary after 1 week of preschool:

He usually says: "Ya". Now, he says, "Yes" instead.

He usually says: "What's that?". Now, he says, "What is this?" instead.

And one day, Ethan walked into Nai2's room. Nai2's was shredding old docs by hand. Ethan made a real mess by throwing and kicking the shredded papers all over the carpet. Nai2 got a bit angry. Ethan got a bit upset and come running to me, crying a bit. Then, he went back to Nai2 and say this: "Don't cry, Nai2". I guess he learned this at school as his teacher tries to calm him down when he has to say bye2 to Papi in the morning ... "Don't cry, Ethan".

And Ethan can drink from a cup nice and easy, without spilling the water. Yippeee!!!