could tank
Verbo regular: tank - tanked- tanked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could tank
you could tank
he could tank
we could tank
you could tank
they could tank 	I could be tanking
you could be tanking
he could be tanking
we could be tanking
you could be tanking
they could be tanking	I could have tanked
you could have tanked
he could have tanked
we could have tanked
you could have tanked
they could have tanked	I could have been tanking
you could have been tanking
he could have been tanking
we could have been tanking
you could have been tanking
they could have been tanking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not tank
you could not tank
he could not tank
we could not tank
you could not tank
they could not tank 	I could not be tanking
you could not be tanking
he could not be tanking
we could not be tanking
you could not be tanking
they could not be tanking	I could not have tanked
you could not have tanked
he could not have tanked
we could not have tanked
you could not have tanked
they could not have tanked	I could not have been tanking
you could not have been tanking
he could not have been tanking
we could not have been tanking
you could not have been tanking
they could not have been tanking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I tank?
could you tank?
could he tank?
could we tank?
could you tank?
could they tank? 	could I be tanking?
could you be tanking?
could he be tanking?
could we be tanking?
could you be tanking?
could they be tanking? 	could I have tanked?
could you have tanked?
could he have tanked?
could we have tanked?
could you have tanked?
could they have tanked? 	could I have been tanking?
could you have been tanking?
could he have been tanking?
could we have been tanking?
could you have been tanking?
could they have been tanking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not tank?
could you not tank?
could he not tank?
could we not tank?
could you not tank?
could they not tank? 	could I not be tanking?
could you not be tanking?
could he not be tanking?
could we not be tanking?
could you not be tanking?
could they not be tanking? 	could I not have tanked?
could you not have tanked?
could he not have tanked?
could we not have tanked?
could you not have tanked?
could they not have tanked? 	could I not have been tanking?
could you not have been tanking?
could he not have been tanking?
could we not have been tanking?
could you not have been tanking?
could they not have been tanking?