may warn
Regular verb: warn - warned- warned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may warn
you may warn
he may warn
we may warn
you may warn
they may warn 	I may be warning
you may be warning
he may be warning
we may be warning
you may be warning
they may be warning	I may have warned
you may have warned
he may have warned
we may have warned
you may have warned
they may have warned	I may have been warning
you may have been warning
he may have been warning
we may have been warning
you may have been warning
they may have been warning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may not warn
you may not warn
he may not warn
we may not warn
you may not warn
they may not warn 	I may not be warning
you may not be warning
he may not be warning
we may not be warning
you may not be warning
they may not be warning	I may not have warned
you may not have warned
he may not have warned
we may not have warned
you may not have warned
they may not have warned	I may not have been warning
you may not have been warning
he may not have been warning
we may not have been warning
you may not have been warning
they may not have been warning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I warn?
may you warn?
may he warn?
may we warn?
may you warn?
may they warn? 	may I be warning?
may you be warning?
may he be warning?
may we be warning?
may you be warning?
may they be warning? 	may I have warned?
may you have warned?
may he have warned?
may we have warned?
may you have warned?
may they have warned? 	may I have been warning?
may you have been warning?
may he have been warning?
may we have been warning?
may you have been warning?
may they have been warning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I not warn?
may you not warn?
may he not warn?
may we not warn?
may you not warn?
may they not warn? 	may I not be warning?
may you not be warning?
may he not be warning?
may we not be warning?
may you not be warning?
may they not be warning? 	may I not have warned?
may you not have warned?
may he not have warned?
may we not have warned?
may you not have warned?
may they not have warned? 	may I not have been warning?
may you not have been warning?
may he not have been warning?
may we not have been warning?
may you not have been warning?
may they not have been warning?