I must retort you must retort she must retort we must retort you must retort they must retort
V-ing form
I must be retorting you must be retorting she must be retorting we must be retorting you must be retorting they must be retorting
Perfect
I must have retorted you must have retorted she must have retorted we must have retorted you must have retorted they must have retorted
V-ing perfect
I must have been retorting you must have been retorting she must have been retorting we must have been retorting you must have been retorting they must have been retorting
Negation
Simple form
I must not retort you must not retort she must not retort we must not retort you must not retort they must not retort
V-ing form
I must not be retorting you must not be retorting she must not be retorting we must not be retorting you must not be retorting they must not be retorting
Perfect
I must not have retorted you must not have retorted she must not have retorted we must not have retorted you must not have retorted they must not have retorted
V-ing perfect
I must not have been retorting you must not have been retorting she must not have been retorting we must not have been retorting you must not have been retorting they must not have been retorting
Interrogative form
Simple form
must I retort? must you retort? must she retort? must we retort? must you retort? must they retort?
V-ing form
must I be retorting? must you be retorting? must she be retorting? must we be retorting? must you be retorting? must they be retorting?
Perfect
must I have retorted? must you have retorted? must she have retorted? must we have retorted? must you have retorted? must they have retorted?
V-ing perfect
must I have been retorting? must you have been retorting? must she have been retorting? must we have been retorting? must you have been retorting? must they have been retorting?
Interro-negative form
Simple form
must I not retort? must you not retort? must she not retort? must we not retort? must you not retort? must they not retort?
V-ing form
must I not be retorting? must you not be retorting? must she not be retorting? must we not be retorting? must you not be retorting? must they not be retorting?
Perfect
must I not have retorted? must you not have retorted? must she not have retorted? must we not have retorted? must you not have retorted? must they not have retorted?
V-ing perfect
must I not have been retorting? must you not have been retorting? must she not have been retorting? must we not have been retorting? must you not have been retorting? must they not have been retorting?