I must marvel you must marvel he must marvel we must marvel you must marvel they must marvel
V-ing form
I must be marvelling you must be marvelling he must be marvelling we must be marvelling you must be marvelling they must be marvelling
Perfect
I must have marvelled you must have marvelled he must have marvelled we must have marvelled you must have marvelled they must have marvelled
V-ing perfect
I must have been marvelling you must have been marvelling he must have been marvelling we must have been marvelling you must have been marvelling they must have been marvelling
Negation
Simple form
I must not marvel you must not marvel he must not marvel we must not marvel you must not marvel they must not marvel
V-ing form
I must not be marvelling you must not be marvelling he must not be marvelling we must not be marvelling you must not be marvelling they must not be marvelling
Perfect
I must not have marvelled you must not have marvelled he must not have marvelled we must not have marvelled you must not have marvelled they must not have marvelled
V-ing perfect
I must not have been marvelling you must not have been marvelling he must not have been marvelling we must not have been marvelling you must not have been marvelling they must not have been marvelling
Interrogative form
Simple form
must I marvel? must you marvel? must he marvel? must we marvel? must you marvel? must they marvel?
V-ing form
must I be marvelling? must you be marvelling? must he be marvelling? must we be marvelling? must you be marvelling? must they be marvelling?
Perfect
must I have marvelled? must you have marvelled? must he have marvelled? must we have marvelled? must you have marvelled? must they have marvelled?
V-ing perfect
must I have been marvelling? must you have been marvelling? must he have been marvelling? must we have been marvelling? must you have been marvelling? must they have been marvelling?
Interro-negative form
Simple form
must I not marvel? must you not marvel? must he not marvel? must we not marvel? must you not marvel? must they not marvel?
V-ing form
must I not be marvelling? must you not be marvelling? must he not be marvelling? must we not be marvelling? must you not be marvelling? must they not be marvelling?
Perfect
must I not have marvelled? must you not have marvelled? must he not have marvelled? must we not have marvelled? must you not have marvelled? must they not have marvelled?
V-ing perfect
must I not have been marvelling? must you not have been marvelling? must he not have been marvelling? must we not have been marvelling? must you not have been marvelling? must they not have been marvelling?