could surfboard
Verbo regular: surfboard - surfboarded- surfboarded

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could surfboard
you could surfboard
he could surfboard
we could surfboard
you could surfboard
they could surfboard 	I could be surfboarding
you could be surfboarding
he could be surfboarding
we could be surfboarding
you could be surfboarding
they could be surfboarding	I could have surfboarded
you could have surfboarded
he could have surfboarded
we could have surfboarded
you could have surfboarded
they could have surfboarded	I could have been surfboarding
you could have been surfboarding
he could have been surfboarding
we could have been surfboarding
you could have been surfboarding
they could have been surfboarding	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not surfboard
you could not surfboard
he could not surfboard
we could not surfboard
you could not surfboard
they could not surfboard 	I could not be surfboarding
you could not be surfboarding
he could not be surfboarding
we could not be surfboarding
you could not be surfboarding
they could not be surfboarding	I could not have surfboarded
you could not have surfboarded
he could not have surfboarded
we could not have surfboarded
you could not have surfboarded
they could not have surfboarded	I could not have been surfboarding
you could not have been surfboarding
he could not have been surfboarding
we could not have been surfboarding
you could not have been surfboarding
they could not have been surfboarding	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I surfboard?
could you surfboard?
could he surfboard?
could we surfboard?
could you surfboard?
could they surfboard? 	could I be surfboarding?
could you be surfboarding?
could he be surfboarding?
could we be surfboarding?
could you be surfboarding?
could they be surfboarding? 	could I have surfboarded?
could you have surfboarded?
could he have surfboarded?
could we have surfboarded?
could you have surfboarded?
could they have surfboarded? 	could I have been surfboarding?
could you have been surfboarding?
could he have been surfboarding?
could we have been surfboarding?
could you have been surfboarding?
could they have been surfboarding? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not surfboard?
could you not surfboard?
could he not surfboard?
could we not surfboard?
could you not surfboard?
could they not surfboard? 	could I not be surfboarding?
could you not be surfboarding?
could he not be surfboarding?
could we not be surfboarding?
could you not be surfboarding?
could they not be surfboarding? 	could I not have surfboarded?
could you not have surfboarded?
could he not have surfboarded?
could we not have surfboarded?
could you not have surfboarded?
could they not have surfboarded? 	could I not have been surfboarding?
could you not have been surfboarding?
could he not have been surfboarding?
could we not have been surfboarding?
could you not have been surfboarding?
could they not have been surfboarding?