may fail
Regular verb: fail - failed- failed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may fail
you may fail
she may fail
we may fail
you may fail
they may fail 	I may be failing
you may be failing
she may be failing
we may be failing
you may be failing
they may be failing	I may have failed
you may have failed
she may have failed
we may have failed
you may have failed
they may have failed	I may have been failing
you may have been failing
she may have been failing
we may have been failing
you may have been failing
they may have been failing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't fail
you mayn't fail
she mayn't fail
we mayn't fail
you mayn't fail
they mayn't fail 	I mayn't be failing
you mayn't be failing
she mayn't be failing
we mayn't be failing
you mayn't be failing
they mayn't be failing	I mayn't have failed
you mayn't have failed
she mayn't have failed
we mayn't have failed
you mayn't have failed
they mayn't have failed	I mayn't have been failing
you mayn't have been failing
she mayn't have been failing
we mayn't have been failing
you mayn't have been failing
they mayn't have been failing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I fail?
may you fail?
may she fail?
may we fail?
may you fail?
may they fail? 	may I be failing?
may you be failing?
may she be failing?
may we be failing?
may you be failing?
may they be failing? 	may I have failed?
may you have failed?
may she have failed?
may we have failed?
may you have failed?
may they have failed? 	may I have been failing?
may you have been failing?
may she have been failing?
may we have been failing?
may you have been failing?
may they have been failing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I fail?
mayn't you fail?
mayn't she fail?
mayn't we fail?
mayn't you fail?
mayn't they fail? 	mayn't I be failing?
mayn't you be failing?
mayn't she be failing?
mayn't we be failing?
mayn't you be failing?
mayn't they be failing? 	mayn't I have failed?
mayn't you have failed?
mayn't she have failed?
mayn't we have failed?
mayn't you have failed?
mayn't they have failed? 	mayn't I have been failing?
mayn't you have been failing?
mayn't she have been failing?
mayn't we have been failing?
mayn't you have been failing?
mayn't they have been failing?