=(3x)²  - 1 = 9x² - 1

a / b

in + tháng năm

in

If she weren't lazy, she could pass the exam

cô mik dạy thế mà -_-

Happy Birthday song is sung well by her

Dinner is cooked for us by my mother everyday

Football is played together

My grandparents were visited by me last week

The trees were watered by me 2 days ago

This story was told for my children by me last night

study/studies