must calve
Regular verb: calve - calved- calved

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must calve
you must calve
she must calve
we must calve
you must calve
they must calve 	I must be calving
you must be calving
she must be calving
we must be calving
you must be calving
they must be calving	I must have calved
you must have calved
she must have calved
we must have calved
you must have calved
they must have calved	I must have been calving
you must have been calving
she must have been calving
we must have been calving
you must have been calving
they must have been calving	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't calve
you mustn't calve
she mustn't calve
we mustn't calve
you mustn't calve
they mustn't calve 	I mustn't be calving
you mustn't be calving
she mustn't be calving
we mustn't be calving
you mustn't be calving
they mustn't be calving	I mustn't have calved
you mustn't have calved
she mustn't have calved
we mustn't have calved
you mustn't have calved
they mustn't have calved	I mustn't have been calving
you mustn't have been calving
she mustn't have been calving
we mustn't have been calving
you mustn't have been calving
they mustn't have been calving	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I calve?
must you calve?
must she calve?
must we calve?
must you calve?
must they calve? 	must I be calving?
must you be calving?
must she be calving?
must we be calving?
must you be calving?
must they be calving? 	must I have calved?
must you have calved?
must she have calved?
must we have calved?
must you have calved?
must they have calved? 	must I have been calving?
must you have been calving?
must she have been calving?
must we have been calving?
must you have been calving?
must they have been calving? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I calve?
mustn't you calve?
mustn't she calve?
mustn't we calve?
mustn't you calve?
mustn't they calve? 	mustn't I be calving?
mustn't you be calving?
mustn't she be calving?
mustn't we be calving?
mustn't you be calving?
mustn't they be calving? 	mustn't I have calved?
mustn't you have calved?
mustn't she have calved?
mustn't we have calved?
mustn't you have calved?
mustn't they have calved? 	mustn't I have been calving?
mustn't you have been calving?
mustn't she have been calving?
mustn't we have been calving?
mustn't you have been calving?
mustn't they have been calving?