Bài 12. Counting from 0 to 10
Bài 13. How many?
Bài 14. Counting from 10 to 20
Bài 15. Counting from 10 to 100
Bài 16. Hundred, Thousand and Million
Bài 17. Present forms of BE (am, is, are)
Bài 18. Subject Pronouns (I, you, he, she, it, we, they)
Bài 19. Forming Sentences with BE
Bài 20. Negative Forms of BE and Questions
