Form of to be:
I - am
He,she,it - is
We,you,they - are
Nathan is(потому-что he) eleven years old.He`s from Newcastle in England.
Raikhan is(потому-что he) ten years old.He`s from Semey in Kazakhstan.
Oleg and Tanya are(потому-что they) thirteen years old.They from Novosibirsk in Russia.
Yuki and Satoshi are(потому-что they) twelve years old.They from Osaka in Japan.