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