modals of obligation

Question 1

obligation modals

Answer 1

must, have to, should, supposed to

Question 2

must

Answer 2

authority of the obligation is from the speaker (basically saying that the obligation is to be done by the speaker)

maybe directed to the speaker or the listener

subjective obligation - obligation is to be done by the subject

express goal/necessity

Question 3

have to

Answer 3

external obligation or comes from the outside not the speaker/subject
may be rules or rehulation imposed by the law
may express obligation on the past (had to )
semi-modal changes when conjugated

Question 4

should

Answer 4

weak obligation
give advice and suggestion