must undergird
Verbo irregular: undergird - undergirt, undergirded- undergirt, undergirded

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must undergird
you must undergird
he must undergird
we must undergird
you must undergird
they must undergird 	I must be undergirding
you must be undergirding
he must be undergirding
we must be undergirding
you must be undergirding
they must be undergirding	I must have undergirt, undergirded
you must have undergirt, undergirded
he must have undergirt, undergirded
we must have undergirt, undergirded
you must have undergirt, undergirded
they must have undergirt, undergirded	I must have been undergirding
you must have been undergirding
he must have been undergirding
we must have been undergirding
you must have been undergirding
they must have been undergirding	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not undergird
you must not undergird
he must not undergird
we must not undergird
you must not undergird
they must not undergird 	I must not be undergirding
you must not be undergirding
he must not be undergirding
we must not be undergirding
you must not be undergirding
they must not be undergirding	I must not have undergirt, undergirded
you must not have undergirt, undergirded
he must not have undergirt, undergirded
we must not have undergirt, undergirded
you must not have undergirt, undergirded
they must not have undergirt, undergirded	I must not have been undergirding
you must not have been undergirding
he must not have been undergirding
we must not have been undergirding
you must not have been undergirding
they must not have been undergirding	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I undergird?
must you undergird?
must he undergird?
must we undergird?
must you undergird?
must they undergird? 	must I be undergirding?
must you be undergirding?
must he be undergirding?
must we be undergirding?
must you be undergirding?
must they be undergirding? 	must I have undergirt, undergirded?
must you have undergirt, undergirded?
must he have undergirt, undergirded?
must we have undergirt, undergirded?
must you have undergirt, undergirded?
must they have undergirt, undergirded? 	must I have been undergirding?
must you have been undergirding?
must he have been undergirding?
must we have been undergirding?
must you have been undergirding?
must they have been undergirding? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not undergird?
must you not undergird?
must he not undergird?
must we not undergird?
must you not undergird?
must they not undergird? 	must I not be undergirding?
must you not be undergirding?
must he not be undergirding?
must we not be undergirding?
must you not be undergirding?
must they not be undergirding? 	must I not have undergirt, undergirded?
must you not have undergirt, undergirded?
must he not have undergirt, undergirded?
must we not have undergirt, undergirded?
must you not have undergirt, undergirded?
must they not have undergirt, undergirded? 	must I not have been undergirding?
must you not have been undergirding?
must he not have been undergirding?
must we not have been undergirding?
must you not have been undergirding?
must they not have been undergirding?