English verb conjugation
MAY BACKFILL

Regular verb: backfill - backfilled - backfilled

Affirmation

Simple form	V-ing form
I may backfill you may backfill he may backfill we may backfill you may backfill they may backfill	I may be backfilling you may be backfilling he may be backfilling we may be backfilling you may be backfilling they may be backfilling
Perfect	V-ing perfect
I may have backfilled you may have backfilled he may have backfilled we may have backfilled you may have backfilled they may have backfilled	I may have been backfilling you may have been backfilling he may have been backfilling we may have been backfilling you may have been backfilling they may have been backfilling

Negation

Simple form	V-ing form
I mayn't backfill you mayn't backfill he mayn't backfill we mayn't backfill you mayn't backfill they mayn't backfill	I mayn't be backfilling you mayn't be backfilling he mayn't be backfilling we mayn't be backfilling you mayn't be backfilling they mayn't be backfilling
Perfect	V-ing perfect
I mayn't have backfilled you mayn't have backfilled he mayn't have backfilled we mayn't have backfilled you mayn't have backfilled they mayn't have backfilled	I mayn't have been backfilling you mayn't have been backfilling he mayn't have been backfilling we mayn't have been backfilling you mayn't have been backfilling they mayn't have been backfilling

Interrogative form

Simple form	V-ing form
may I backfill? may you backfill? may he backfill? may we backfill? may you backfill? may they backfill?	may I be backfilling? may you be backfilling? may he be backfilling? may we be backfilling? may you be backfilling? may they be backfilling?
Perfect	V-ing perfect
may I have backfilled? may you have backfilled? may he have backfilled? may we have backfilled? may you have backfilled? may they have backfilled?	may I have been backfilling? may you have been backfilling? may he have been backfilling? may we have been backfilling? may you have been backfilling? may they have been backfilling?

Interro-negative form

Simple form	V-ing form
mayn't I backfill? mayn't you backfill? mayn't he backfill? mayn't we backfill? mayn't you backfill? mayn't they backfill?	mayn't I be backfilling? mayn't you be backfilling? mayn't he be backfilling? mayn't we be backfilling? mayn't you be backfilling? mayn't they be backfilling?
Perfect	V-ing perfect
mayn't I have backfilled? mayn't you have backfilled? mayn't he have backfilled? mayn't we have backfilled? mayn't you have backfilled? mayn't they have backfilled?	mayn't I have been backfilling? mayn't you have been backfilling? mayn't he have been backfilling? mayn't we have been backfilling? mayn't you have been backfilling? mayn't they have been backfilling?