I used to go to a public school. Were the teachers strict to the children? I'm a good student now, but I didn't use to be one. When I entered the room, the man was shouting. While I was writing the last answer, the teacher told me to stop. I didn't fail any of my exams. Kate is a friendly person.

I USED to go to a public schoo.  

Were the teachers STRICT?

I didn't USE to be a good student.

WHEN I came into the room, the man was shouting.

WHILE I was writing the last answer, the teacher told me to stop.

I didn't FAIL my exams.

Kate is FRIENDLY with new people.