could wax
Verbo regular: wax - waxed- waxed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could wax
you could wax
he could wax
we could wax
you could wax
they could wax 	I could be waxing
you could be waxing
he could be waxing
we could be waxing
you could be waxing
they could be waxing	I could have waxed
you could have waxed
he could have waxed
we could have waxed
you could have waxed
they could have waxed	I could have been waxing
you could have been waxing
he could have been waxing
we could have been waxing
you could have been waxing
they could have been waxing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not wax
you could not wax
he could not wax
we could not wax
you could not wax
they could not wax 	I could not be waxing
you could not be waxing
he could not be waxing
we could not be waxing
you could not be waxing
they could not be waxing	I could not have waxed
you could not have waxed
he could not have waxed
we could not have waxed
you could not have waxed
they could not have waxed	I could not have been waxing
you could not have been waxing
he could not have been waxing
we could not have been waxing
you could not have been waxing
they could not have been waxing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I wax?
could you wax?
could he wax?
could we wax?
could you wax?
could they wax? 	could I be waxing?
could you be waxing?
could he be waxing?
could we be waxing?
could you be waxing?
could they be waxing? 	could I have waxed?
could you have waxed?
could he have waxed?
could we have waxed?
could you have waxed?
could they have waxed? 	could I have been waxing?
could you have been waxing?
could he have been waxing?
could we have been waxing?
could you have been waxing?
could they have been waxing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not wax?
could you not wax?
could he not wax?
could we not wax?
could you not wax?
could they not wax? 	could I not be waxing?
could you not be waxing?
could he not be waxing?
could we not be waxing?
could you not be waxing?
could they not be waxing? 	could I not have waxed?
could you not have waxed?
could he not have waxed?
could we not have waxed?
could you not have waxed?
could they not have waxed? 	could I not have been waxing?
could you not have been waxing?
could he not have been waxing?
could we not have been waxing?
could you not have been waxing?
could they not have been waxing?