I must crunch you must crunch he must crunch we must crunch you must crunch they must crunch
V-ing form
I must be crunching you must be crunching he must be crunching we must be crunching you must be crunching they must be crunching
Perfect
I must have crunched you must have crunched he must have crunched we must have crunched you must have crunched they must have crunched
V-ing perfect
I must have been crunching you must have been crunching he must have been crunching we must have been crunching you must have been crunching they must have been crunching
Negation
Simple form
I must not crunch you must not crunch he must not crunch we must not crunch you must not crunch they must not crunch
V-ing form
I must not be crunching you must not be crunching he must not be crunching we must not be crunching you must not be crunching they must not be crunching
Perfect
I must not have crunched you must not have crunched he must not have crunched we must not have crunched you must not have crunched they must not have crunched
V-ing perfect
I must not have been crunching you must not have been crunching he must not have been crunching we must not have been crunching you must not have been crunching they must not have been crunching
Interrogative form
Simple form
must I crunch? must you crunch? must he crunch? must we crunch? must you crunch? must they crunch?
V-ing form
must I be crunching? must you be crunching? must he be crunching? must we be crunching? must you be crunching? must they be crunching?
Perfect
must I have crunched? must you have crunched? must he have crunched? must we have crunched? must you have crunched? must they have crunched?
V-ing perfect
must I have been crunching? must you have been crunching? must he have been crunching? must we have been crunching? must you have been crunching? must they have been crunching?
Interro-negative form
Simple form
must I not crunch? must you not crunch? must he not crunch? must we not crunch? must you not crunch? must they not crunch?
V-ing form
must I not be crunching? must you not be crunching? must he not be crunching? must we not be crunching? must you not be crunching? must they not be crunching?
Perfect
must I not have crunched? must you not have crunched? must he not have crunched? must we not have crunched? must you not have crunched? must they not have crunched?
V-ing perfect
must I not have been crunching? must you not have been crunching? must he not have been crunching? must we not have been crunching? must you not have been crunching? must they not have been crunching?