English verb conjugation
MUST VALVE

Regular verb: valve - valved - valved

Affirmation

Simple form	V-ing form
I must valve you must valve she must valve we must valve you must valve they must valve	I must be valving you must be valving she 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 she 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 she 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 she 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 she 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 she 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 she 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 she valve? must we valve? must you valve? must they valve?	must I be valving? must you be valving? must she 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 she 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 she 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 she 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 she 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 she 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 she have been valving? mustn't we have been valving? mustn't you have been valving? mustn't they have been valving?