must mash
Regular verb: mash - mashed- mashed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must mash
you must mash
he must mash
we must mash
you must mash
they must mash 	I must be mashing
you must be mashing
he must be mashing
we must be mashing
you must be mashing
they must be mashing	I must have mashed
you must have mashed
he must have mashed
we must have mashed
you must have mashed
they must have mashed	I must have been mashing
you must have been mashing
he must have been mashing
we must have been mashing
you must have been mashing
they must have been mashing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't mash
you mustn't mash
he mustn't mash
we mustn't mash
you mustn't mash
they mustn't mash 	I mustn't be mashing
you mustn't be mashing
he mustn't be mashing
we mustn't be mashing
you mustn't be mashing
they mustn't be mashing	I mustn't have mashed
you mustn't have mashed
he mustn't have mashed
we mustn't have mashed
you mustn't have mashed
they mustn't have mashed	I mustn't have been mashing
you mustn't have been mashing
he mustn't have been mashing
we mustn't have been mashing
you mustn't have been mashing
they mustn't have been mashing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I mash?
must you mash?
must he mash?
must we mash?
must you mash?
must they mash? 	must I be mashing?
must you be mashing?
must he be mashing?
must we be mashing?
must you be mashing?
must they be mashing? 	must I have mashed?
must you have mashed?
must he have mashed?
must we have mashed?
must you have mashed?
must they have mashed? 	must I have been mashing?
must you have been mashing?
must he have been mashing?
must we have been mashing?
must you have been mashing?
must they have been mashing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I mash?
mustn't you mash?
mustn't he mash?
mustn't we mash?
mustn't you mash?
mustn't they mash? 	mustn't I be mashing?
mustn't you be mashing?
mustn't he be mashing?
mustn't we be mashing?
mustn't you be mashing?
mustn't they be mashing? 	mustn't I have mashed?
mustn't you have mashed?
mustn't he have mashed?
mustn't we have mashed?
mustn't you have mashed?
mustn't they have mashed? 	mustn't I have been mashing?
mustn't you have been mashing?
mustn't he have been mashing?
mustn't we have been mashing?
mustn't you have been mashing?
mustn't they have been mashing?