English verb conjugation
MUST BUILD

Irregular verb: build - built - built

Affirmation

Simple form	V-ing form
I must build you must build she must build we must build you must build they must build	I must be building you must be building she must be building we must be building you must be building they must be building
Perfect	V-ing perfect
I must have built you must have built she must have built we must have built you must have built they must have built	I must have been building you must have been building she must have been building we must have been building you must have been building they must have been building

Negation

Simple form	V-ing form
I mustn't build you mustn't build she mustn't build we mustn't build you mustn't build they mustn't build	I mustn't be building you mustn't be building she mustn't be building we mustn't be building you mustn't be building they mustn't be building
Perfect	V-ing perfect
I mustn't have built you mustn't have built she mustn't have built we mustn't have built you mustn't have built they mustn't have built	I mustn't have been building you mustn't have been building she mustn't have been building we mustn't have been building you mustn't have been building they mustn't have been building

Interrogative form

Simple form	V-ing form
must I build? must you build? must she build? must we build? must you build? must they build?	must I be building? must you be building? must she be building? must we be building? must you be building? must they be building?
Perfect	V-ing perfect
must I have built? must you have built? must she have built? must we have built? must you have built? must they have built?	must I have been building? must you have been building? must she have been building? must we have been building? must you have been building? must they have been building?

Interro-negative form

Simple form	V-ing form
mustn't I build? mustn't you build? mustn't she build? mustn't we build? mustn't you build? mustn't they build?	mustn't I be building? mustn't you be building? mustn't she be building? mustn't we be building? mustn't you be building? mustn't they be building?
Perfect	V-ing perfect
mustn't I have built? mustn't you have built? mustn't she have built? mustn't we have built? mustn't you have built? mustn't they have built?	mustn't I have been building? mustn't you have been building? mustn't she have been building? mustn't we have been building? mustn't you have been building? mustn't they have been building?