English verb conjugation
MAY BACK

Regular verb: back - backed - backed

Affirmation

Simple form	V-ing form
I may back you may back he may back we may back you may back they may back	I may be backing you may be backing he may be backing we may be backing you may be backing they may be backing
Perfect	V-ing perfect
I may have backed you may have backed he may have backed we may have backed you may have backed they may have backed	I may have been backing you may have been backing he may have been backing we may have been backing you may have been backing they may have been backing

Negation

Simple form	V-ing form
I mayn't back you mayn't back he mayn't back we mayn't back you mayn't back they mayn't back	I mayn't be backing you mayn't be backing he mayn't be backing we mayn't be backing you mayn't be backing they mayn't be backing
Perfect	V-ing perfect
I mayn't have backed you mayn't have backed he mayn't have backed we mayn't have backed you mayn't have backed they mayn't have backed	I mayn't have been backing you mayn't have been backing he mayn't have been backing we mayn't have been backing you mayn't have been backing they mayn't have been backing

Interrogative form

Simple form	V-ing form
may I back? may you back? may he back? may we back? may you back? may they back?	may I be backing? may you be backing? may he be backing? may we be backing? may you be backing? may they be backing?
Perfect	V-ing perfect
may I have backed? may you have backed? may he have backed? may we have backed? may you have backed? may they have backed?	may I have been backing? may you have been backing? may he have been backing? may we have been backing? may you have been backing? may they have been backing?

Interro-negative form

Simple form	V-ing form
mayn't I back? mayn't you back? mayn't he back? mayn't we back? mayn't you back? mayn't they back?	mayn't I be backing? mayn't you be backing? mayn't he be backing? mayn't we be backing? mayn't you be backing? mayn't they be backing?
Perfect	V-ing perfect
mayn't I have backed? mayn't you have backed? mayn't he have backed? mayn't we have backed? mayn't you have backed? mayn't they have backed?	mayn't I have been backing? mayn't you have been backing? mayn't he have been backing? mayn't we have been backing? mayn't you have been backing? mayn't they have been backing?