I may prevent you may prevent he may prevent we may prevent you may prevent they may prevent
V-ing form
I may be preventing you may be preventing he may be preventing we may be preventing you may be preventing they may be preventing
Perfect
I may have prevented you may have prevented he may have prevented we may have prevented you may have prevented they may have prevented
V-ing perfect
I may have been preventing you may have been preventing he may have been preventing we may have been preventing you may have been preventing they may have been preventing
Negation
Simple form
I may not prevent you may not prevent he may not prevent we may not prevent you may not prevent they may not prevent
V-ing form
I may not be preventing you may not be preventing he may not be preventing we may not be preventing you may not be preventing they may not be preventing
Perfect
I may not have prevented you may not have prevented he may not have prevented we may not have prevented you may not have prevented they may not have prevented
V-ing perfect
I may not have been preventing you may not have been preventing he may not have been preventing we may not have been preventing you may not have been preventing they may not have been preventing
Interrogative form
Simple form
may I prevent? may you prevent? may he prevent? may we prevent? may you prevent? may they prevent?
V-ing form
may I be preventing? may you be preventing? may he be preventing? may we be preventing? may you be preventing? may they be preventing?
Perfect
may I have prevented? may you have prevented? may he have prevented? may we have prevented? may you have prevented? may they have prevented?
V-ing perfect
may I have been preventing? may you have been preventing? may he have been preventing? may we have been preventing? may you have been preventing? may they have been preventing?
Interro-negative form
Simple form
may I not prevent? may you not prevent? may he not prevent? may we not prevent? may you not prevent? may they not prevent?
V-ing form
may I not be preventing? may you not be preventing? may he not be preventing? may we not be preventing? may you not be preventing? may they not be preventing?
Perfect
may I not have prevented? may you not have prevented? may he not have prevented? may we not have prevented? may you not have prevented? may they not have prevented?
V-ing perfect
may I not have been preventing? may you not have been preventing? may he not have been preventing? may we not have been preventing? may you not have been preventing? may they not have been preventing?