English verb conjugation
MAY PREVENT

Regular verb: prevent - prevented - prevented

Affirmation

Simple form	V-ing form
I may prevent you may prevent he may prevent we may prevent you may prevent they may prevent	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	V-ing 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	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	V-ing form
I mayn't prevent you mayn't prevent he mayn't prevent we mayn't prevent you mayn't prevent they mayn't prevent	I mayn't be preventing you mayn't be preventing he mayn't be preventing we mayn't be preventing you mayn't be preventing they mayn't be preventing
Perfect	V-ing perfect
I mayn't have prevented you mayn't have prevented he mayn't have prevented we mayn't have prevented you mayn't have prevented they mayn't have prevented	I mayn't have been preventing you mayn't have been preventing he mayn't have been preventing we mayn't have been preventing you mayn't have been preventing they mayn't have been preventing

Interrogative form

Simple form	V-ing form
may I prevent? may you prevent? may he prevent? may we prevent? may you prevent? may they prevent?	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	V-ing 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?	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	V-ing form
mayn't I prevent? mayn't you prevent? mayn't he prevent? mayn't we prevent? mayn't you prevent? mayn't they prevent?	mayn't I be preventing? mayn't you be preventing? mayn't he be preventing? mayn't we be preventing? mayn't you be preventing? mayn't they be preventing?
Perfect	V-ing perfect
mayn't I have prevented? mayn't you have prevented? mayn't he have prevented? mayn't we have prevented? mayn't you have prevented? mayn't they have prevented?	mayn't I have been preventing? mayn't you have been preventing? mayn't he have been preventing? mayn't we have been preventing? mayn't you have been preventing? mayn't they have been preventing?