could gain
Verbo regular: gain - gained- gained

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could gain
you could gain
he could gain
we could gain
you could gain
they could gain 	I could be gaining
you could be gaining
he could be gaining
we could be gaining
you could be gaining
they could be gaining	I could have gained
you could have gained
he could have gained
we could have gained
you could have gained
they could have gained	I could have been gaining
you could have been gaining
he could have been gaining
we could have been gaining
you could have been gaining
they could have been gaining	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't gain
you couldn't gain
he couldn't gain
we couldn't gain
you couldn't gain
they couldn't gain 	I couldn't be gaining
you couldn't be gaining
he couldn't be gaining
we couldn't be gaining
you couldn't be gaining
they couldn't be gaining	I couldn't have gained
you couldn't have gained
he couldn't have gained
we couldn't have gained
you couldn't have gained
they couldn't have gained	I couldn't have been gaining
you couldn't have been gaining
he couldn't have been gaining
we couldn't have been gaining
you couldn't have been gaining
they couldn't have been gaining	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I gain?
could you gain?
could he gain?
could we gain?
could you gain?
could they gain? 	could I be gaining?
could you be gaining?
could he be gaining?
could we be gaining?
could you be gaining?
could they be gaining? 	could I have gained?
could you have gained?
could he have gained?
could we have gained?
could you have gained?
could they have gained? 	could I have been gaining?
could you have been gaining?
could he have been gaining?
could we have been gaining?
could you have been gaining?
could they have been gaining? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I gain?
couldn't you gain?
couldn't he gain?
couldn't we gain?
couldn't you gain?
couldn't they gain? 	couldn't I be gaining?
couldn't you be gaining?
couldn't he be gaining?
couldn't we be gaining?
couldn't you be gaining?
couldn't they be gaining? 	couldn't I have gained?
couldn't you have gained?
couldn't he have gained?
couldn't we have gained?
couldn't you have gained?
couldn't they have gained? 	couldn't I have been gaining?
couldn't you have been gaining?
couldn't he have been gaining?
couldn't we have been gaining?
couldn't you have been gaining?
couldn't they have been gaining?