must build
Verbo irregular: build - built- built

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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	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	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not build
you must not build
she must not build
we must not build
you must not build
they must not build 	I must not be building
you must not be building
she must not be building
we must not be building
you must not be building
they must not be building	I must not have built
you must not have built
she must not have built
we must not have built
you must not have built
they must not have built	I must not have been building
you must not have been building
she must not have been building
we must not have been building
you must not have been building
they must not have been building	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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? 	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? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not build?
must you not build?
must she not build?
must we not build?
must you not build?
must they not build? 	must I not be building?
must you not be building?
must she not be building?
must we not be building?
must you not be building?
must they not be building? 	must I not have built?
must you not have built?
must she not have built?
must we not have built?
must you not have built?
must they not have built? 	must I not have been building?
must you not have been building?
must she not have been building?
must we not have been building?
must you not have been building?
must they not have been building?