could enhance
Verbo regular: enhance - enhanced- enhanced

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could enhance
you could enhance
he could enhance
we could enhance
you could enhance
they could enhance 	I could be enhancing
you could be enhancing
he could be enhancing
we could be enhancing
you could be enhancing
they could be enhancing	I could have enhanced
you could have enhanced
he could have enhanced
we could have enhanced
you could have enhanced
they could have enhanced	I could have been enhancing
you could have been enhancing
he could have been enhancing
we could have been enhancing
you could have been enhancing
they could have been enhancing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not enhance
you could not enhance
he could not enhance
we could not enhance
you could not enhance
they could not enhance 	I could not be enhancing
you could not be enhancing
he could not be enhancing
we could not be enhancing
you could not be enhancing
they could not be enhancing	I could not have enhanced
you could not have enhanced
he could not have enhanced
we could not have enhanced
you could not have enhanced
they could not have enhanced	I could not have been enhancing
you could not have been enhancing
he could not have been enhancing
we could not have been enhancing
you could not have been enhancing
they could not have been enhancing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I enhance?
could you enhance?
could he enhance?
could we enhance?
could you enhance?
could they enhance? 	could I be enhancing?
could you be enhancing?
could he be enhancing?
could we be enhancing?
could you be enhancing?
could they be enhancing? 	could I have enhanced?
could you have enhanced?
could he have enhanced?
could we have enhanced?
could you have enhanced?
could they have enhanced? 	could I have been enhancing?
could you have been enhancing?
could he have been enhancing?
could we have been enhancing?
could you have been enhancing?
could they have been enhancing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not enhance?
could you not enhance?
could he not enhance?
could we not enhance?
could you not enhance?
could they not enhance? 	could I not be enhancing?
could you not be enhancing?
could he not be enhancing?
could we not be enhancing?
could you not be enhancing?
could they not be enhancing? 	could I not have enhanced?
could you not have enhanced?
could he not have enhanced?
could we not have enhanced?
could you not have enhanced?
could they not have enhanced? 	could I not have been enhancing?
could you not have been enhancing?
could he not have been enhancing?
could we not have been enhancing?
could you not have been enhancing?
could they not have been enhancing?