English verb conjugation
MUST SCALE

Regular verb: scale - scaled - scaled

Affirmation

Simple form	V-ing form
I must scale you must scale he must scale we must scale you must scale they must scale	I must be scaling you must be scaling he must be scaling we must be scaling you must be scaling they must be scaling
Perfect	V-ing perfect
I must have scaled you must have scaled he must have scaled we must have scaled you must have scaled they must have scaled	I must have been scaling you must have been scaling he must have been scaling we must have been scaling you must have been scaling they must have been scaling

Negation

Simple form	V-ing form
I mustn't scale you mustn't scale he mustn't scale we mustn't scale you mustn't scale they mustn't scale	I mustn't be scaling you mustn't be scaling he mustn't be scaling we mustn't be scaling you mustn't be scaling they mustn't be scaling
Perfect	V-ing perfect
I mustn't have scaled you mustn't have scaled he mustn't have scaled we mustn't have scaled you mustn't have scaled they mustn't have scaled	I mustn't have been scaling you mustn't have been scaling he mustn't have been scaling we mustn't have been scaling you mustn't have been scaling they mustn't have been scaling

Interrogative form

Simple form	V-ing form
must I scale? must you scale? must he scale? must we scale? must you scale? must they scale?	must I be scaling? must you be scaling? must he be scaling? must we be scaling? must you be scaling? must they be scaling?
Perfect	V-ing perfect
must I have scaled? must you have scaled? must he have scaled? must we have scaled? must you have scaled? must they have scaled?	must I have been scaling? must you have been scaling? must he have been scaling? must we have been scaling? must you have been scaling? must they have been scaling?

Interro-negative form

Simple form	V-ing form
mustn't I scale? mustn't you scale? mustn't he scale? mustn't we scale? mustn't you scale? mustn't they scale?	mustn't I be scaling? mustn't you be scaling? mustn't he be scaling? mustn't we be scaling? mustn't you be scaling? mustn't they be scaling?
Perfect	V-ing perfect
mustn't I have scaled? mustn't you have scaled? mustn't he have scaled? mustn't we have scaled? mustn't you have scaled? mustn't they have scaled?	mustn't I have been scaling? mustn't you have been scaling? mustn't he have been scaling? mustn't we have been scaling? mustn't you have been scaling? mustn't they have been scaling?