I must kitten you must kitten she must kitten we must kitten you must kitten they must kitten
V-ing form
I must be kittening you must be kittening she must be kittening we must be kittening you must be kittening they must be kittening
Perfect
I must have kittened you must have kittened she must have kittened we must have kittened you must have kittened they must have kittened
V-ing perfect
I must have been kittening you must have been kittening she must have been kittening we must have been kittening you must have been kittening they must have been kittening
Negation
Simple form
I must not kitten you must not kitten she must not kitten we must not kitten you must not kitten they must not kitten
V-ing form
I must not be kittening you must not be kittening she must not be kittening we must not be kittening you must not be kittening they must not be kittening
Perfect
I must not have kittened you must not have kittened she must not have kittened we must not have kittened you must not have kittened they must not have kittened
V-ing perfect
I must not have been kittening you must not have been kittening she must not have been kittening we must not have been kittening you must not have been kittening they must not have been kittening
Interrogative form
Simple form
must I kitten? must you kitten? must she kitten? must we kitten? must you kitten? must they kitten?
V-ing form
must I be kittening? must you be kittening? must she be kittening? must we be kittening? must you be kittening? must they be kittening?
Perfect
must I have kittened? must you have kittened? must she have kittened? must we have kittened? must you have kittened? must they have kittened?
V-ing perfect
must I have been kittening? must you have been kittening? must she have been kittening? must we have been kittening? must you have been kittening? must they have been kittening?
Interro-negative form
Simple form
must I not kitten? must you not kitten? must she not kitten? must we not kitten? must you not kitten? must they not kitten?
V-ing form
must I not be kittening? must you not be kittening? must she not be kittening? must we not be kittening? must you not be kittening? must they not be kittening?
Perfect
must I not have kittened? must you not have kittened? must she not have kittened? must we not have kittened? must you not have kittened? must they not have kittened?
V-ing perfect
must I not have been kittening? must you not have been kittening? must she not have been kittening? must we not have been kittening? must you not have been kittening? must they not have been kittening?