4 1= could not c, 2= must e, 3= needed g, 4= may a, 5= mustn't d, 6= have to a, 7= might a, 8= needn't h, 9= can b, 10= dont...have to i, 11= outght to f, 12= should f
5 1 needn't / don't need to / don't have to
2 can't / cannot
3 must / has to
4 could / may / might
5 couldn't
6 had to /needed to
7 ought
8 mustn't / must not
6 Answers 1 and 2: the writer is unsure
Answers 3 and 4: the writer is certain
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