1- This is the best film i’ve ever seen.
I have never seen such the best film before 
2- My school has over 800 students.
There are over 800 students in my shool
3- It was mistake for him to buy that house.
Buying that house was his mistake
4- Lan said to her brother, “ I didn’t use your phone.”
Lan said to her brother that she hadn't used her brother phone
5- He is too short to play basketball.
He is not tall enough to play basketball