Нужно найти предложения в которых есть ошибкиI musn039;t forget to lock

Нужно отыскать предложения в которых есть оплошности

I musn't forget to lock the door.
Ali shouldn't eat so much ice-cream
Perhaps Eda must go to a different school
You should buy a bigger table
The train is at nine. I don't be late