I may stamp you may stamp he may stamp we may stamp you may stamp they may stamp
V-ing form
I may be stamping you may be stamping he may be stamping we may be stamping you may be stamping they may be stamping
Perfect
I may have stamped you may have stamped he may have stamped we may have stamped you may have stamped they may have stamped
V-ing perfect
I may have been stamping you may have been stamping he may have been stamping we may have been stamping you may have been stamping they may have been stamping
Negation
Simple form
I may not stamp you may not stamp he may not stamp we may not stamp you may not stamp they may not stamp
V-ing form
I may not be stamping you may not be stamping he may not be stamping we may not be stamping you may not be stamping they may not be stamping
Perfect
I may not have stamped you may not have stamped he may not have stamped we may not have stamped you may not have stamped they may not have stamped
V-ing perfect
I may not have been stamping you may not have been stamping he may not have been stamping we may not have been stamping you may not have been stamping they may not have been stamping
Interrogative form
Simple form
may I stamp? may you stamp? may he stamp? may we stamp? may you stamp? may they stamp?
V-ing form
may I be stamping? may you be stamping? may he be stamping? may we be stamping? may you be stamping? may they be stamping?
Perfect
may I have stamped? may you have stamped? may he have stamped? may we have stamped? may you have stamped? may they have stamped?
V-ing perfect
may I have been stamping? may you have been stamping? may he have been stamping? may we have been stamping? may you have been stamping? may they have been stamping?
Interro-negative form
Simple form
may I not stamp? may you not stamp? may he not stamp? may we not stamp? may you not stamp? may they not stamp?
V-ing form
may I not be stamping? may you not be stamping? may he not be stamping? may we not be stamping? may you not be stamping? may they not be stamping?
Perfect
may I not have stamped? may you not have stamped? may he not have stamped? may we not have stamped? may you not have stamped? may they not have stamped?
V-ing perfect
may I not have been stamping? may you not have been stamping? may he not have been stamping? may we not have been stamping? may you not have been stamping? may they not have been stamping?