English verb conjugation
MUST CALVE

Regular verb: calve - calved - calved

Affirmation

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