Obligation and Prohibition

Meaning	Temprorary or Permanent (Rules, customs, manners)	ONLY Permanent (Laws)
(+) Obligation → Necessary to do something.	You have to pay before you start.        [have] + V-infinitive. (past) You had to pay before you started. (future) You’ll have to pay before you start.	(+) You must turn off your cell phone.        [must] + V-base
(-) Prohitiion → Necessary NOT to something	You can’t talk near here.       [Can not] + V-base. (past) You couldn’t talk near here.  (future) You won’t be able to talk near here next week.	(-) You must not eat or drink in here.           [must not] + V-base
(-) Optional → No  Obligation	You don’t have to pay. [don’t have] + V-infinitive.

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