$1$. This is our school
$=>$ This school is ours
$2.$ What is the distance between Vinh and Ha Noi city?
$=>$ How far is it from Vinh to Ha Noi city ?
$3$. I often walked to school when i was a student
$=>$ I used to walk to school when I was a student.
$4.$ Althought they are short, they still love playing sports
$=>$ In spite of being short, they still love playing sports.