I may vary you may vary she may vary we may vary you may vary they may vary
V-ing form
I may be varying you may be varying she may be varying we may be varying you may be varying they may be varying
Perfect
I may have varied you may have varied she may have varied we may have varied you may have varied they may have varied
V-ing perfect
I may have been varying you may have been varying she may have been varying we may have been varying you may have been varying they may have been varying
Negation
Simple form
I may not vary you may not vary she may not vary we may not vary you may not vary they may not vary
V-ing form
I may not be varying you may not be varying she may not be varying we may not be varying you may not be varying they may not be varying
Perfect
I may not have varied you may not have varied she may not have varied we may not have varied you may not have varied they may not have varied
V-ing perfect
I may not have been varying you may not have been varying she may not have been varying we may not have been varying you may not have been varying they may not have been varying
Interrogative form
Simple form
may I vary? may you vary? may she vary? may we vary? may you vary? may they vary?
V-ing form
may I be varying? may you be varying? may she be varying? may we be varying? may you be varying? may they be varying?
Perfect
may I have varied? may you have varied? may she have varied? may we have varied? may you have varied? may they have varied?
V-ing perfect
may I have been varying? may you have been varying? may she have been varying? may we have been varying? may you have been varying? may they have been varying?
Interro-negative form
Simple form
may I not vary? may you not vary? may she not vary? may we not vary? may you not vary? may they not vary?
V-ing form
may I not be varying? may you not be varying? may she not be varying? may we not be varying? may you not be varying? may they not be varying?
Perfect
may I not have varied? may you not have varied? may she not have varied? may we not have varied? may you not have varied? may they not have varied?
V-ing perfect
may I not have been varying? may you not have been varying? may she not have been varying? may we not have been varying? may you not have been varying? may they not have been varying?