Apologising

TEACHER - Hey girls! Hang on a minute.
FABI - Oh, No. i think we're in trouble
TEACHER - I saw you leave the computers on.
TIS - Oh, I'm really sorry. We forgot to turn them off.
TEACHER - Well, can you remember next time, please?
FABI - Yes, of course.
FABI- We don't mean to cause a problem. We'll go and turn them off now.