I must chagrin you must chagrin she must chagrin we must chagrin you must chagrin they must chagrin
V-ing form
I must be chagrining you must be chagrining she must be chagrining we must be chagrining you must be chagrining they must be chagrining
Perfect
I must have chagrined you must have chagrined she must have chagrined we must have chagrined you must have chagrined they must have chagrined
V-ing perfect
I must have been chagrining you must have been chagrining she must have been chagrining we must have been chagrining you must have been chagrining they must have been chagrining
Negation
Simple form
I must not chagrin you must not chagrin she must not chagrin we must not chagrin you must not chagrin they must not chagrin
V-ing form
I must not be chagrining you must not be chagrining she must not be chagrining we must not be chagrining you must not be chagrining they must not be chagrining
Perfect
I must not have chagrined you must not have chagrined she must not have chagrined we must not have chagrined you must not have chagrined they must not have chagrined
V-ing perfect
I must not have been chagrining you must not have been chagrining she must not have been chagrining we must not have been chagrining you must not have been chagrining they must not have been chagrining
Interrogative form
Simple form
must I chagrin? must you chagrin? must she chagrin? must we chagrin? must you chagrin? must they chagrin?
V-ing form
must I be chagrining? must you be chagrining? must she be chagrining? must we be chagrining? must you be chagrining? must they be chagrining?
Perfect
must I have chagrined? must you have chagrined? must she have chagrined? must we have chagrined? must you have chagrined? must they have chagrined?
V-ing perfect
must I have been chagrining? must you have been chagrining? must she have been chagrining? must we have been chagrining? must you have been chagrining? must they have been chagrining?
Interro-negative form
Simple form
must I not chagrin? must you not chagrin? must she not chagrin? must we not chagrin? must you not chagrin? must they not chagrin?
V-ing form
must I not be chagrining? must you not be chagrining? must she not be chagrining? must we not be chagrining? must you not be chagrining? must they not be chagrining?
Perfect
must I not have chagrined? must you not have chagrined? must she not have chagrined? must we not have chagrined? must you not have chagrined? must they not have chagrined?
V-ing perfect
must I not have been chagrining? must you not have been chagrining? must she not have been chagrining? must we not have been chagrining? must you not have been chagrining? must they not have been chagrining?