could summer
Verbo regular: summer - summered- summered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could summer
you could summer
he could summer
we could summer
you could summer
they could summer 	I could be summering
you could be summering
he could be summering
we could be summering
you could be summering
they could be summering	I could have summered
you could have summered
he 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
he could have been summering
we could have been summering
you could have been summering
they could have been summering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not summer
you could not summer
he 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
he 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
he 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
he could not have been summering
we could not have been summering
you could not have been summering
they could not have been summering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I summer?
could you summer?
could he summer?
could we summer?
could you summer?
could they summer? 	could I be summering?
could you be summering?
could he be summering?
could we be summering?
could you be summering?
could they be summering? 	could I have summered?
could you have summered?
could he 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 he have been summering?
could we have been summering?
could you have been summering?
could they have been summering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not summer?
could you not summer?
could he 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 he 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 he 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 he not have been summering?
could we not have been summering?
could you not have been summering?
could they not have been summering?