could smudge
Verbo regular: smudge - smudged- smudged

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could smudge
you could smudge
he could smudge
we could smudge
you could smudge
they could smudge 	I could be smudging
you could be smudging
he could be smudging
we could be smudging
you could be smudging
they could be smudging	I could have smudged
you could have smudged
he could have smudged
we could have smudged
you could have smudged
they could have smudged	I could have been smudging
you could have been smudging
he could have been smudging
we could have been smudging
you could have been smudging
they could have been smudging	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't smudge
you couldn't smudge
he couldn't smudge
we couldn't smudge
you couldn't smudge
they couldn't smudge 	I couldn't be smudging
you couldn't be smudging
he couldn't be smudging
we couldn't be smudging
you couldn't be smudging
they couldn't be smudging	I couldn't have smudged
you couldn't have smudged
he couldn't have smudged
we couldn't have smudged
you couldn't have smudged
they couldn't have smudged	I couldn't have been smudging
you couldn't have been smudging
he couldn't have been smudging
we couldn't have been smudging
you couldn't have been smudging
they couldn't have been smudging	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I smudge?
could you smudge?
could he smudge?
could we smudge?
could you smudge?
could they smudge? 	could I be smudging?
could you be smudging?
could he be smudging?
could we be smudging?
could you be smudging?
could they be smudging? 	could I have smudged?
could you have smudged?
could he have smudged?
could we have smudged?
could you have smudged?
could they have smudged? 	could I have been smudging?
could you have been smudging?
could he have been smudging?
could we have been smudging?
could you have been smudging?
could they have been smudging? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I smudge?
couldn't you smudge?
couldn't he smudge?
couldn't we smudge?
couldn't you smudge?
couldn't they smudge? 	couldn't I be smudging?
couldn't you be smudging?
couldn't he be smudging?
couldn't we be smudging?
couldn't you be smudging?
couldn't they be smudging? 	couldn't I have smudged?
couldn't you have smudged?
couldn't he have smudged?
couldn't we have smudged?
couldn't you have smudged?
couldn't they have smudged? 	couldn't I have been smudging?
couldn't you have been smudging?
couldn't he have been smudging?
couldn't we have been smudging?
couldn't you have been smudging?
couldn't they have been smudging?