English verb conjugation
MUST HELVE

Regular verb: helve - helved - helved

Affirmation

Simple form	V-ing form
I must helve you must helve he must helve we must helve you must helve they must helve	I must be helving you must be helving he must be helving we must be helving you must be helving they must be helving
Perfect	V-ing perfect
I must have helved you must have helved he must have helved we must have helved you must have helved they must have helved	I must have been helving you must have been helving he must have been helving we must have been helving you must have been helving they must have been helving

Negation

Simple form	V-ing form
I mustn't helve you mustn't helve he mustn't helve we mustn't helve you mustn't helve they mustn't helve	I mustn't be helving you mustn't be helving he mustn't be helving we mustn't be helving you mustn't be helving they mustn't be helving
Perfect	V-ing perfect
I mustn't have helved you mustn't have helved he mustn't have helved we mustn't have helved you mustn't have helved they mustn't have helved	I mustn't have been helving you mustn't have been helving he mustn't have been helving we mustn't have been helving you mustn't have been helving they mustn't have been helving

Interrogative form

Simple form	V-ing form
must I helve? must you helve? must he helve? must we helve? must you helve? must they helve?	must I be helving? must you be helving? must he be helving? must we be helving? must you be helving? must they be helving?
Perfect	V-ing perfect
must I have helved? must you have helved? must he have helved? must we have helved? must you have helved? must they have helved?	must I have been helving? must you have been helving? must he have been helving? must we have been helving? must you have been helving? must they have been helving?

Interro-negative form

Simple form	V-ing form
mustn't I helve? mustn't you helve? mustn't he helve? mustn't we helve? mustn't you helve? mustn't they helve?	mustn't I be helving? mustn't you be helving? mustn't he be helving? mustn't we be helving? mustn't you be helving? mustn't they be helving?
Perfect	V-ing perfect
mustn't I have helved? mustn't you have helved? mustn't he have helved? mustn't we have helved? mustn't you have helved? mustn't they have helved?	mustn't I have been helving? mustn't you have been helving? mustn't he have been helving? mustn't we have been helving? mustn't you have been helving? mustn't they have been helving?