1
The modal verbs of obligation are:
Must, Have to
Should
Could, can
Might, may
2
The modal verbs of abilty are:
Might, can
May, have to
Should, must
Could, can
3
The modal verb of advice are:
Could, might
Must, can
Should
May, have to
4
The modal verbs of permission are:
Should, can, have to
Must, could, might
Could, should, must
Can, could, may
5
The modal verbs of Possibility are are:
May, must, should, can
Have to, can, might, may
Might, may, could, can
Could, should, have to, may
