Materi stating obligation and necessity dan contoh dialognya. When we use must this usually means that the obligations comes from the speaker its like a personal obligation whereas have to normally means that the obligation is external. An Obligation is a course of action that someone is required to take whether legal or moral.
Contoh dialog obligation Expressing Obligation.
I have got to learn English if I want to live in the USA. Sorry sirr I must help my parent new can to go school. S must V1. Kamu harus memperbaiki jamku.