must crunch
Regular verb: crunch - crunched- crunched

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must crunch
you must crunch
she must crunch
we must crunch
you must crunch
they must crunch 	I must be crunching
you must be crunching
she must be crunching
we must be crunching
you must be crunching
they must be crunching	I must have crunched
you must have crunched
she must have crunched
we must have crunched
you must have crunched
they must have crunched	I must have been crunching
you must have been crunching
she must have been crunching
we must have been crunching
you must have been crunching
they must have been crunching	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't crunch
you mustn't crunch
she mustn't crunch
we mustn't crunch
you mustn't crunch
they mustn't crunch 	I mustn't be crunching
you mustn't be crunching
she mustn't be crunching
we mustn't be crunching
you mustn't be crunching
they mustn't be crunching	I mustn't have crunched
you mustn't have crunched
she mustn't have crunched
we mustn't have crunched
you mustn't have crunched
they mustn't have crunched	I mustn't have been crunching
you mustn't have been crunching
she mustn't have been crunching
we mustn't have been crunching
you mustn't have been crunching
they mustn't have been crunching	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I crunch?
must you crunch?
must she crunch?
must we crunch?
must you crunch?
must they crunch? 	must I be crunching?
must you be crunching?
must she be crunching?
must we be crunching?
must you be crunching?
must they be crunching? 	must I have crunched?
must you have crunched?
must she have crunched?
must we have crunched?
must you have crunched?
must they have crunched? 	must I have been crunching?
must you have been crunching?
must she have been crunching?
must we have been crunching?
must you have been crunching?
must they have been crunching? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I crunch?
mustn't you crunch?
mustn't she crunch?
mustn't we crunch?
mustn't you crunch?
mustn't they crunch? 	mustn't I be crunching?
mustn't you be crunching?
mustn't she be crunching?
mustn't we be crunching?
mustn't you be crunching?
mustn't they be crunching? 	mustn't I have crunched?
mustn't you have crunched?
mustn't she have crunched?
mustn't we have crunched?
mustn't you have crunched?
mustn't they have crunched? 	mustn't I have been crunching?
mustn't you have been crunching?
mustn't she have been crunching?
mustn't we have been crunching?
mustn't you have been crunching?
mustn't they have been crunching?