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
she could dust
we could dust
you could dust
they could dust 	I could be dusting
you could be dusting
she could be dusting
we could be dusting
you could be dusting
they could be dusting	I could have dusted
you could have dusted
she 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
she 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
she 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
she 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
she 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
she 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 she dust?
could we dust?
could you dust?
could they dust? 	could I be dusting?
could you be dusting?
could she be dusting?
could we be dusting?
could you be dusting?
could they be dusting? 	could I have dusted?
could you have dusted?
could she 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 she 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 she 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 she 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 she 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 she have been dusting?
couldn't we have been dusting?
couldn't you have been dusting?
couldn't they have been dusting?