could floss
Verbo regular: floss - flossed- flossed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could floss
you could floss
he could floss
we could floss
you could floss
they could floss 	I could be flossing
you could be flossing
he could be flossing
we could be flossing
you could be flossing
they could be flossing	I could have flossed
you could have flossed
he could have flossed
we could have flossed
you could have flossed
they could have flossed	I could have been flossing
you could have been flossing
he could have been flossing
we could have been flossing
you could have been flossing
they could have been flossing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't floss
you couldn't floss
he couldn't floss
we couldn't floss
you couldn't floss
they couldn't floss 	I couldn't be flossing
you couldn't be flossing
he couldn't be flossing
we couldn't be flossing
you couldn't be flossing
they couldn't be flossing	I couldn't have flossed
you couldn't have flossed
he couldn't have flossed
we couldn't have flossed
you couldn't have flossed
they couldn't have flossed	I couldn't have been flossing
you couldn't have been flossing
he couldn't have been flossing
we couldn't have been flossing
you couldn't have been flossing
they couldn't have been flossing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I floss?
could you floss?
could he floss?
could we floss?
could you floss?
could they floss? 	could I be flossing?
could you be flossing?
could he be flossing?
could we be flossing?
could you be flossing?
could they be flossing? 	could I have flossed?
could you have flossed?
could he have flossed?
could we have flossed?
could you have flossed?
could they have flossed? 	could I have been flossing?
could you have been flossing?
could he have been flossing?
could we have been flossing?
could you have been flossing?
could they have been flossing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I floss?
couldn't you floss?
couldn't he floss?
couldn't we floss?
couldn't you floss?
couldn't they floss? 	couldn't I be flossing?
couldn't you be flossing?
couldn't he be flossing?
couldn't we be flossing?
couldn't you be flossing?
couldn't they be flossing? 	couldn't I have flossed?
couldn't you have flossed?
couldn't he have flossed?
couldn't we have flossed?
couldn't you have flossed?
couldn't they have flossed? 	couldn't I have been flossing?
couldn't you have been flossing?
couldn't he have been flossing?
couldn't we have been flossing?
couldn't you have been flossing?
couldn't they have been flossing?