could overlap
Regular verb: overlap - overlapped- overlapped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could overlap
you could overlap
he could overlap
we could overlap
you could overlap
they could overlap 	I could be overlapping
you could be overlapping
he could be overlapping
we could be overlapping
you could be overlapping
they could be overlapping	I could have overlapped
you could have overlapped
he could have overlapped
we could have overlapped
you could have overlapped
they could have overlapped	I could have been overlapping
you could have been overlapping
he could have been overlapping
we could have been overlapping
you could have been overlapping
they could have been overlapping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't overlap
you couldn't overlap
he couldn't overlap
we couldn't overlap
you couldn't overlap
they couldn't overlap 	I couldn't be overlapping
you couldn't be overlapping
he couldn't be overlapping
we couldn't be overlapping
you couldn't be overlapping
they couldn't be overlapping	I couldn't have overlapped
you couldn't have overlapped
he couldn't have overlapped
we couldn't have overlapped
you couldn't have overlapped
they couldn't have overlapped	I couldn't have been overlapping
you couldn't have been overlapping
he couldn't have been overlapping
we couldn't have been overlapping
you couldn't have been overlapping
they couldn't have been overlapping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I overlap?
could you overlap?
could he overlap?
could we overlap?
could you overlap?
could they overlap? 	could I be overlapping?
could you be overlapping?
could he be overlapping?
could we be overlapping?
could you be overlapping?
could they be overlapping? 	could I have overlapped?
could you have overlapped?
could he have overlapped?
could we have overlapped?
could you have overlapped?
could they have overlapped? 	could I have been overlapping?
could you have been overlapping?
could he have been overlapping?
could we have been overlapping?
could you have been overlapping?
could they have been overlapping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I overlap?
couldn't you overlap?
couldn't he overlap?
couldn't we overlap?
couldn't you overlap?
couldn't they overlap? 	couldn't I be overlapping?
couldn't you be overlapping?
couldn't he be overlapping?
couldn't we be overlapping?
couldn't you be overlapping?
couldn't they be overlapping? 	couldn't I have overlapped?
couldn't you have overlapped?
couldn't he have overlapped?
couldn't we have overlapped?
couldn't you have overlapped?
couldn't they have overlapped? 	couldn't I have been overlapping?
couldn't you have been overlapping?
couldn't he have been overlapping?
couldn't we have been overlapping?
couldn't you have been overlapping?
couldn't they have been overlapping?