5:08

might

6:02

should have

8:19

could

14:18

PAST MODALS: could have | may have | might have | must have | should have | would have - GRAMMAR

8:28

used to be used to

10:19

no or not

12:24

MAY HAVE, MIGHT HAVE for Past Possibility - Advanced English Grammar

12:42

PAST MODALS: Might've, Could've, Should've, Would've, Must've....