I'm sorry to have to call you.很抱歉，但是我必须给你通电话。
I regret to inform you that...我很遗憾的通知你
I have some bad news.我有些坏消息。
I asked you to come in because we need to talk about your daughter's attitude/behavior/grades/homework/tardiness/absences
A: Hi. You must be Ben's mother.
B: Hi. Nice to meet you, Mr Kim. I'm Ben's mother, Linda.
A: I asked you to come in today to talk about your son's behavior in class. Your son is very disruptive in class and has problems paying attention and getting along with other students.
B: Oh. Really?
A: Yes. Your son often gets into fights with other students. If it happens once more. There is a possibility that he will be expelled from school.
B: I'm terribly sorry that my son has caused you so much trouble.
A: It's not about me, it's about your son. His grades are falling too.
B: I'll have a talk with my son tonight.