could dust
Verbo regular: dust - dusted- dusted

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com 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	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not dust
you could not dust
she could not dust
we could not dust
you could not dust
they could not dust 	I could not be dusting
you could not be dusting
she could not be dusting
we could not be dusting
you could not be dusting
they could not be dusting	I could not have dusted
you could not have dusted
she could not have dusted
we could not have dusted
you could not have dusted
they could not have dusted	I could not have been dusting
you could not have been dusting
she could not have been dusting
we could not have been dusting
you could not have been dusting
they could not have been dusting	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com 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-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not dust?
could you not dust?
could she not dust?
could we not dust?
could you not dust?
could they not dust? 	could I not be dusting?
could you not be dusting?
could she not be dusting?
could we not be dusting?
could you not be dusting?
could they not be dusting? 	could I not have dusted?
could you not have dusted?
could she not have dusted?
could we not have dusted?
could you not have dusted?
could they not have dusted? 	could I not have been dusting?
could you not have been dusting?
could she not have been dusting?
could we not have been dusting?
could you not have been dusting?
could they not have been dusting?