English verb conjugation
COULD DUST

Regular verb: dust - dusted - dusted

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
I could not dust you could not dust he 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 he could not be dusting we could not be dusting you could not be dusting they could not be dusting
Perfect	V-ing perfect
I could not have dusted you could not have dusted he 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 he could not have been dusting we could not have been dusting you could not have been dusting they could not have been dusting

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?

Interro-negative form

Simple form	V-ing form
could I not dust? could you not dust? could he 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 he not be dusting? could we not be dusting? could you not be dusting? could they not be dusting?
Perfect	V-ing perfect
could I not have dusted? could you not have dusted? could he 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 he not have been dusting? could we not have been dusting? could you not have been dusting? could they not have been dusting?