buatlah dialog asking necesity and obligation

G: why are you late ?
M: sorry sirr , i must help my parent , new can to go school.
G: whatever your reasons, and you must know, all student must obey the school rulles.
M: yes sir , i'm sory.
G: okay, i forgive. But you must in law

obligation=keharusan

a: B, i'm sorry because yesterday i can't come to school. what should i do for the project?

b: its okay. you must find out about the narative text

a: i think its too hard can u change it?

b: im sorry i cant, theacher has chosen u to do that

a:well, thankyou.

b: you're welcome