In the process of learning mother tongue, it might be different from contry to contry though, what are children learn?

I wonder what they learn at 3 years old.

In Korea, I heard children can speak a bit fluently than before and make full sentences around 3 year old. 

Although they made simple sentences with mistakes.

They start to learn Korean alphabet, '가, 갸, 거, 겨....' and some easy words by flash cards.

And  they practice some onomatopoeias in the kindergarten.

In Korea, I think many children learned the verb "주세요" and "감사합니다" at this age,  natural way.

They are a kind of asking form and honorific form in Korean.  

I don't think it can be suitable way for adult's language learning.

But I think it's helpful to understand the order to learn new language.   
So, I wonder what they are learning in your country.

In America, at the 3 year old children what they learn? And what about Spain children?

And in your country's children? 

* I'm so poor at English, if my English is weird, I'm sorry.