may prevent
Regular verb: prevent - prevented- prevented

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may prevent
you may prevent
she may prevent
we may prevent
you may prevent
they may prevent 	I may be preventing
you may be preventing
she may be preventing
we may be preventing
you may be preventing
they may be preventing	I may have prevented
you may have prevented
she 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
she 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 	Perfect 	V-ing perfect 	
I may not prevent
you may not prevent
she may not prevent
we may not prevent
you may not prevent
they may not prevent 	I may not be preventing
you may not be preventing
she may not be preventing
we may not be preventing
you may not be preventing
they may not be preventing	I may not have prevented
you may not have prevented
she may not have prevented
we may not have prevented
you may not have prevented
they may not have prevented	I may not have been preventing
you may not have been preventing
she 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 	V-ing form 	Perfect 	V-ing perfect 	
may I prevent?
may you prevent?
may she prevent?
may we prevent?
may you prevent?
may they prevent? 	may I be preventing?
may you be preventing?
may she be preventing?
may we be preventing?
may you be preventing?
may they be preventing? 	may I have prevented?
may you have prevented?
may she 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 she 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 	Perfect 	V-ing perfect 	
may I not prevent?
may you not prevent?
may she not prevent?
may we not prevent?
may you not prevent?
may they not prevent? 	may I not be preventing?
may you not be preventing?
may she not be preventing?
may we not be preventing?
may you not be preventing?
may they not be preventing? 	may I not have prevented?
may you not have prevented?
may she not have prevented?
may we not have prevented?
may you not have prevented?
may they not have prevented? 	may I not have been preventing?
may you not have been preventing?
may she not have been preventing?
may we not have been preventing?
may you not have been preventing?
may they not have been preventing?