could undergird
Irregular verb: undergird - undergirt, undergirded- undergirt, undergirded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could undergird
you could undergird
he could undergird
we could undergird
you could undergird
they could undergird 	I could be undergirding
you could be undergirding
he could be undergirding
we could be undergirding
you could be undergirding
they could be undergirding	I could have undergirt, undergirded
you could have undergirt, undergirded
he could have undergirt, undergirded
we could have undergirt, undergirded
you could have undergirt, undergirded
they could have undergirt, undergirded	I could have been undergirding
you could have been undergirding
he could have been undergirding
we could have been undergirding
you could have been undergirding
they could have been undergirding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't undergird
you couldn't undergird
he couldn't undergird
we couldn't undergird
you couldn't undergird
they couldn't undergird 	I couldn't be undergirding
you couldn't be undergirding
he couldn't be undergirding
we couldn't be undergirding
you couldn't be undergirding
they couldn't be undergirding	I couldn't have undergirt, undergirded
you couldn't have undergirt, undergirded
he couldn't have undergirt, undergirded
we couldn't have undergirt, undergirded
you couldn't have undergirt, undergirded
they couldn't have undergirt, undergirded	I couldn't have been undergirding
you couldn't have been undergirding
he couldn't have been undergirding
we couldn't have been undergirding
you couldn't have been undergirding
they couldn't have been undergirding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I undergird?
could you undergird?
could he undergird?
could we undergird?
could you undergird?
could they undergird? 	could I be undergirding?
could you be undergirding?
could he be undergirding?
could we be undergirding?
could you be undergirding?
could they be undergirding? 	could I have undergirt, undergirded?
could you have undergirt, undergirded?
could he have undergirt, undergirded?
could we have undergirt, undergirded?
could you have undergirt, undergirded?
could they have undergirt, undergirded? 	could I have been undergirding?
could you have been undergirding?
could he have been undergirding?
could we have been undergirding?
could you have been undergirding?
could they have been undergirding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I undergird?
couldn't you undergird?
couldn't he undergird?
couldn't we undergird?
couldn't you undergird?
couldn't they undergird? 	couldn't I be undergirding?
couldn't you be undergirding?
couldn't he be undergirding?
couldn't we be undergirding?
couldn't you be undergirding?
couldn't they be undergirding? 	couldn't I have undergirt, undergirded?
couldn't you have undergirt, undergirded?
couldn't he have undergirt, undergirded?
couldn't we have undergirt, undergirded?
couldn't you have undergirt, undergirded?
couldn't they have undergirt, undergirded? 	couldn't I have been undergirding?
couldn't you have been undergirding?
couldn't he have been undergirding?
couldn't we have been undergirding?
couldn't you have been undergirding?
couldn't they have been undergirding?