could overlay
Irregular verb: overlay - overlaid- overlaid

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could overlay
you could overlay
he could overlay
we could overlay
you could overlay
they could overlay 	I could be overlaying
you could be overlaying
he could be overlaying
we could be overlaying
you could be overlaying
they could be overlaying	I could have overlaid
you could have overlaid
he could have overlaid
we could have overlaid
you could have overlaid
they could have overlaid	I could have been overlaying
you could have been overlaying
he could have been overlaying
we could have been overlaying
you could have been overlaying
they could have been overlaying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't overlay
you couldn't overlay
he couldn't overlay
we couldn't overlay
you couldn't overlay
they couldn't overlay 	I couldn't be overlaying
you couldn't be overlaying
he couldn't be overlaying
we couldn't be overlaying
you couldn't be overlaying
they couldn't be overlaying	I couldn't have overlaid
you couldn't have overlaid
he couldn't have overlaid
we couldn't have overlaid
you couldn't have overlaid
they couldn't have overlaid	I couldn't have been overlaying
you couldn't have been overlaying
he couldn't have been overlaying
we couldn't have been overlaying
you couldn't have been overlaying
they couldn't have been overlaying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I overlay?
could you overlay?
could he overlay?
could we overlay?
could you overlay?
could they overlay? 	could I be overlaying?
could you be overlaying?
could he be overlaying?
could we be overlaying?
could you be overlaying?
could they be overlaying? 	could I have overlaid?
could you have overlaid?
could he have overlaid?
could we have overlaid?
could you have overlaid?
could they have overlaid? 	could I have been overlaying?
could you have been overlaying?
could he have been overlaying?
could we have been overlaying?
could you have been overlaying?
could they have been overlaying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I overlay?
couldn't you overlay?
couldn't he overlay?
couldn't we overlay?
couldn't you overlay?
couldn't they overlay? 	couldn't I be overlaying?
couldn't you be overlaying?
couldn't he be overlaying?
couldn't we be overlaying?
couldn't you be overlaying?
couldn't they be overlaying? 	couldn't I have overlaid?
couldn't you have overlaid?
couldn't he have overlaid?
couldn't we have overlaid?
couldn't you have overlaid?
couldn't they have overlaid? 	couldn't I have been overlaying?
couldn't you have been overlaying?
couldn't he have been overlaying?
couldn't we have been overlaying?
couldn't you have been overlaying?
couldn't they have been overlaying?