obligatory

"My obligation to my family means I need to visit them regularly. "

"The teacher is requiring students to submit their essays by Friday. "

"Congress imposed new tariffs."

"One way to encourage your employees to work harder is by giving them incentives."

"My parents are legally obligated to provide for my needs until I turn eighteen. "

"The mandatory for the game requires the players to keep the disc above the painted line. "

"Attendance at the meeting is required."

"She trained seven hours a day to prepare for the Olympics."

"if I make a promise, I always stick to it;  he broke his promise"

"The teacher's instructions were binding; we had to complete the assignment before Friday. "

"He said he didn’t do it, but the evidence was otherwise."

"Morally, it is a difficult issue to deal with."