English verb conjugation
MUST SCALE

Regular verb: scale - scaled - scaled

Affirmation

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