could dust
Verbo regular: dust - dusted- dusted

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could dust
you could dust
he could dust
we could dust
you could dust
they could dust 	I could be dusting
you could be dusting
he could be dusting
we could be dusting
you could be dusting
they could be dusting	I could have dusted
you could have dusted
he could have dusted
we could have dusted
you could have dusted
they could have dusted	I could have been dusting
you could have been dusting
he could have been dusting
we could have been dusting
you could have been dusting
they could have been dusting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't dust
you couldn't dust
he couldn't dust
we couldn't dust
you couldn't dust
they couldn't dust 	I couldn't be dusting
you couldn't be dusting
he couldn't be dusting
we couldn't be dusting
you couldn't be dusting
they couldn't be dusting	I couldn't have dusted
you couldn't have dusted
he couldn't have dusted
we couldn't have dusted
you couldn't have dusted
they couldn't have dusted	I couldn't have been dusting
you couldn't have been dusting
he couldn't have been dusting
we couldn't have been dusting
you couldn't have been dusting
they couldn't have been dusting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I dust?
could you dust?
could he dust?
could we dust?
could you dust?
could they dust? 	could I be dusting?
could you be dusting?
could he be dusting?
could we be dusting?
could you be dusting?
could they be dusting? 	could I have dusted?
could you have dusted?
could he have dusted?
could we have dusted?
could you have dusted?
could they have dusted? 	could I have been dusting?
could you have been dusting?
could he have been dusting?
could we have been dusting?
could you have been dusting?
could they have been dusting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I dust?
couldn't you dust?
couldn't he dust?
couldn't we dust?
couldn't you dust?
couldn't they dust? 	couldn't I be dusting?
couldn't you be dusting?
couldn't he be dusting?
couldn't we be dusting?
couldn't you be dusting?
couldn't they be dusting? 	couldn't I have dusted?
couldn't you have dusted?
couldn't he have dusted?
couldn't we have dusted?
couldn't you have dusted?
couldn't they have dusted? 	couldn't I have been dusting?
couldn't you have been dusting?
couldn't he have been dusting?
couldn't we have been dusting?
couldn't you have been dusting?
couldn't they have been dusting?