I may backfill you may backfill she may backfill we may backfill you may backfill they may backfill
V-ing form
I may be backfilling you may be backfilling she may be backfilling we may be backfilling you may be backfilling they may be backfilling
Perfect
I may have backfilled you may have backfilled she may have backfilled we may have backfilled you may have backfilled they may have backfilled
V-ing perfect
I may have been backfilling you may have been backfilling she may have been backfilling we may have been backfilling you may have been backfilling they may have been backfilling
Negation
Simple form
I may not backfill you may not backfill she may not backfill we may not backfill you may not backfill they may not backfill
V-ing form
I may not be backfilling you may not be backfilling she may not be backfilling we may not be backfilling you may not be backfilling they may not be backfilling
Perfect
I may not have backfilled you may not have backfilled she may not have backfilled we may not have backfilled you may not have backfilled they may not have backfilled
V-ing perfect
I may not have been backfilling you may not have been backfilling she may not have been backfilling we may not have been backfilling you may not have been backfilling they may not have been backfilling
Interrogative form
Simple form
may I backfill? may you backfill? may she backfill? may we backfill? may you backfill? may they backfill?
V-ing form
may I be backfilling? may you be backfilling? may she be backfilling? may we be backfilling? may you be backfilling? may they be backfilling?
Perfect
may I have backfilled? may you have backfilled? may she have backfilled? may we have backfilled? may you have backfilled? may they have backfilled?
V-ing perfect
may I have been backfilling? may you have been backfilling? may she have been backfilling? may we have been backfilling? may you have been backfilling? may they have been backfilling?
Interro-negative form
Simple form
may I not backfill? may you not backfill? may she not backfill? may we not backfill? may you not backfill? may they not backfill?
V-ing form
may I not be backfilling? may you not be backfilling? may she not be backfilling? may we not be backfilling? may you not be backfilling? may they not be backfilling?
Perfect
may I not have backfilled? may you not have backfilled? may she not have backfilled? may we not have backfilled? may you not have backfilled? may they not have backfilled?
V-ing perfect
may I not have been backfilling? may you not have been backfilling? may she not have been backfilling? may we not have been backfilling? may you not have been backfilling? may they not have been backfilling?