English verb conjugation
MAY FAIL

Regular verb: fail - failed - failed

Affirmation

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