English verb conjugation
MUST VALVE

Regular verb: valve - valved - valved

Affirmation

Simple form	V-ing form
I must valve you must valve he must valve we must valve you must valve they must valve	I must be valving you must be valving he must be valving we must be valving you must be valving they must be valving
Perfect	V-ing perfect
I must have valved you must have valved he must have valved we must have valved you must have valved they must have valved	I must have been valving you must have been valving he must have been valving we must have been valving you must have been valving they must have been valving

Negation

Simple form	V-ing form
I mustn't valve you mustn't valve he mustn't valve we mustn't valve you mustn't valve they mustn't valve	I mustn't be valving you mustn't be valving he mustn't be valving we mustn't be valving you mustn't be valving they mustn't be valving
Perfect	V-ing perfect
I mustn't have valved you mustn't have valved he mustn't have valved we mustn't have valved you mustn't have valved they mustn't have valved	I mustn't have been valving you mustn't have been valving he mustn't have been valving we mustn't have been valving you mustn't have been valving they mustn't have been valving

Interrogative form

Simple form	V-ing form
must I valve? must you valve? must he valve? must we valve? must you valve? must they valve?	must I be valving? must you be valving? must he be valving? must we be valving? must you be valving? must they be valving?
Perfect	V-ing perfect
must I have valved? must you have valved? must he have valved? must we have valved? must you have valved? must they have valved?	must I have been valving? must you have been valving? must he have been valving? must we have been valving? must you have been valving? must they have been valving?

Interro-negative form

Simple form	V-ing form
mustn't I valve? mustn't you valve? mustn't he valve? mustn't we valve? mustn't you valve? mustn't they valve?	mustn't I be valving? mustn't you be valving? mustn't he be valving? mustn't we be valving? mustn't you be valving? mustn't they be valving?
Perfect	V-ing perfect
mustn't I have valved? mustn't you have valved? mustn't he have valved? mustn't we have valved? mustn't you have valved? mustn't they have valved?	mustn't I have been valving? mustn't you have been valving? mustn't he have been valving? mustn't we have been valving? mustn't you have been valving? mustn't they have been valving?