... “an” danh từ bắt đầu nguyên âm: a, e, i, o, u Ex: An eraser … b) Dùng “a” cho danh từ bắt đầu phụ âm: b, c, d, … Ex: a book, a class … This / door This / window This / clock That / eraser That / ... … This / door This / window This / clock That / eraser That / waste basket That / table This That This That This That * Wordsquare w o d n i w p e n c i l e d e s k r window pens, board ruler ... board ruler n d o o r u s c h o o l c l o c k e e r a s e r x d r a o b pencil, ( pen ), eraser, school, clock, door, desk ...