must grouch
Regular verb: grouch - grouched- grouched

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must grouch
you must grouch
he must grouch
we must grouch
you must grouch
they must grouch 	I must be grouching
you must be grouching
he must be grouching
we must be grouching
you must be grouching
they must be grouching	I must have grouched
you must have grouched
he must have grouched
we must have grouched
you must have grouched
they must have grouched	I must have been grouching
you must have been grouching
he must have been grouching
we must have been grouching
you must have been grouching
they must have been grouching	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't grouch
you mustn't grouch
he mustn't grouch
we mustn't grouch
you mustn't grouch
they mustn't grouch 	I mustn't be grouching
you mustn't be grouching
he mustn't be grouching
we mustn't be grouching
you mustn't be grouching
they mustn't be grouching	I mustn't have grouched
you mustn't have grouched
he mustn't have grouched
we mustn't have grouched
you mustn't have grouched
they mustn't have grouched	I mustn't have been grouching
you mustn't have been grouching
he mustn't have been grouching
we mustn't have been grouching
you mustn't have been grouching
they mustn't have been grouching	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I grouch?
must you grouch?
must he grouch?
must we grouch?
must you grouch?
must they grouch? 	must I be grouching?
must you be grouching?
must he be grouching?
must we be grouching?
must you be grouching?
must they be grouching? 	must I have grouched?
must you have grouched?
must he have grouched?
must we have grouched?
must you have grouched?
must they have grouched? 	must I have been grouching?
must you have been grouching?
must he have been grouching?
must we have been grouching?
must you have been grouching?
must they have been grouching? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I grouch?
mustn't you grouch?
mustn't he grouch?
mustn't we grouch?
mustn't you grouch?
mustn't they grouch? 	mustn't I be grouching?
mustn't you be grouching?
mustn't he be grouching?
mustn't we be grouching?
mustn't you be grouching?
mustn't they be grouching? 	mustn't I have grouched?
mustn't you have grouched?
mustn't he have grouched?
mustn't we have grouched?
mustn't you have grouched?
mustn't they have grouched? 	mustn't I have been grouching?
mustn't you have been grouching?
mustn't he have been grouching?
mustn't we have been grouching?
mustn't you have been grouching?
mustn't they have been grouching?