could underlay
Irregular verb: underlay - underlaid- underlaid

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could underlay
you could underlay
he could underlay
we could underlay
you could underlay
they could underlay 	I could be underlaying
you could be underlaying
he could be underlaying
we could be underlaying
you could be underlaying
they could be underlaying	I could have underlaid
you could have underlaid
he could have underlaid
we could have underlaid
you could have underlaid
they could have underlaid	I could have been underlaying
you could have been underlaying
he could have been underlaying
we could have been underlaying
you could have been underlaying
they could have been underlaying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't underlay
you couldn't underlay
he couldn't underlay
we couldn't underlay
you couldn't underlay
they couldn't underlay 	I couldn't be underlaying
you couldn't be underlaying
he couldn't be underlaying
we couldn't be underlaying
you couldn't be underlaying
they couldn't be underlaying	I couldn't have underlaid
you couldn't have underlaid
he couldn't have underlaid
we couldn't have underlaid
you couldn't have underlaid
they couldn't have underlaid	I couldn't have been underlaying
you couldn't have been underlaying
he couldn't have been underlaying
we couldn't have been underlaying
you couldn't have been underlaying
they couldn't have been underlaying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I underlay?
could you underlay?
could he underlay?
could we underlay?
could you underlay?
could they underlay? 	could I be underlaying?
could you be underlaying?
could he be underlaying?
could we be underlaying?
could you be underlaying?
could they be underlaying? 	could I have underlaid?
could you have underlaid?
could he have underlaid?
could we have underlaid?
could you have underlaid?
could they have underlaid? 	could I have been underlaying?
could you have been underlaying?
could he have been underlaying?
could we have been underlaying?
could you have been underlaying?
could they have been underlaying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I underlay?
couldn't you underlay?
couldn't he underlay?
couldn't we underlay?
couldn't you underlay?
couldn't they underlay? 	couldn't I be underlaying?
couldn't you be underlaying?
couldn't he be underlaying?
couldn't we be underlaying?
couldn't you be underlaying?
couldn't they be underlaying? 	couldn't I have underlaid?
couldn't you have underlaid?
couldn't he have underlaid?
couldn't we have underlaid?
couldn't you have underlaid?
couldn't they have underlaid? 	couldn't I have been underlaying?
couldn't you have been underlaying?
couldn't he have been underlaying?
couldn't we have been underlaying?
couldn't you have been underlaying?
couldn't they have been underlaying?