could summer
Regular verb: summer - summered- summered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could summer
you could summer
she could summer
we could summer
you could summer
they could summer 	I could be summering
you could be summering
she could be summering
we could be summering
you could be summering
they could be summering	I could have summered
you could have summered
she could have summered
we could have summered
you could have summered
they could have summered	I could have been summering
you could have been summering
she could have been summering
we could have been summering
you could have been summering
they could have been summering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not summer
you could not summer
she could not summer
we could not summer
you could not summer
they could not summer 	I could not be summering
you could not be summering
she could not be summering
we could not be summering
you could not be summering
they could not be summering	I could not have summered
you could not have summered
she could not have summered
we could not have summered
you could not have summered
they could not have summered	I could not have been summering
you could not have been summering
she could not have been summering
we could not have been summering
you could not have been summering
they could not have been summering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I summer?
could you summer?
could she summer?
could we summer?
could you summer?
could they summer? 	could I be summering?
could you be summering?
could she be summering?
could we be summering?
could you be summering?
could they be summering? 	could I have summered?
could you have summered?
could she have summered?
could we have summered?
could you have summered?
could they have summered? 	could I have been summering?
could you have been summering?
could she have been summering?
could we have been summering?
could you have been summering?
could they have been summering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not summer?
could you not summer?
could she not summer?
could we not summer?
could you not summer?
could they not summer? 	could I not be summering?
could you not be summering?
could she not be summering?
could we not be summering?
could you not be summering?
could they not be summering? 	could I not have summered?
could you not have summered?
could she not have summered?
could we not have summered?
could you not have summered?
could they not have summered? 	could I not have been summering?
could you not have been summering?
could she not have been summering?
could we not have been summering?
could you not have been summering?
could they not have been summering?