I can dust you can dust she can dust we can dust you can dust they can dust
V-ing form
I can be dusting you can be dusting she can be dusting we can be dusting you can be dusting they can be dusting
Perfect
I can have dusted you can have dusted she can have dusted we can have dusted you can have dusted they can have dusted
V-ing perfect
I can have been dusting you can have been dusting she can have been dusting we can have been dusting you can have been dusting they can have been dusting
Negation
Simple form
I cannot dust you cannot dust she cannot dust we cannot dust you cannot dust they cannot dust
V-ing form
I cannot be dusting you cannot be dusting she cannot be dusting we cannot be dusting you cannot be dusting they cannot be dusting
Perfect
I cannot have dusted you cannot have dusted she cannot have dusted we cannot have dusted you cannot have dusted they cannot have dusted
V-ing perfect
I cannot have been dusting you cannot have been dusting she cannot have been dusting we cannot have been dusting you cannot have been dusting they cannot have been dusting
Interrogative form
Simple form
can I dust? can you dust? can she dust? can we dust? can you dust? can they dust?
V-ing form
can I be dusting? can you be dusting? can she be dusting? can we be dusting? can you be dusting? can they be dusting?
Perfect
can I have dusted? can you have dusted? can she have dusted? can we have dusted? can you have dusted? can they have dusted?
V-ing perfect
can I have been dusting? can you have been dusting? can she have been dusting? can we have been dusting? can you have been dusting? can they have been dusting?
Interro-negative form
Simple form
can I not dust? can you not dust? can she not dust? can we not dust? can you not dust? can they not dust?
V-ing form
can I not be dusting? can you not be dusting? can she not be dusting? can we not be dusting? can you not be dusting? can they not be dusting?
Perfect
can I not have dusted? can you not have dusted? can she not have dusted? can we not have dusted? can you not have dusted? can they not have dusted?
V-ing perfect
can I not have been dusting? can you not have been dusting? can she not have been dusting? can we not have been dusting? can you not have been dusting? can they not have been dusting?