may backfill
Regular verb: backfill - backfilled- backfilled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
I may not backfill
you may not backfill
he may not backfill
we may not backfill
you may not backfill
they may not backfill 	I may not be backfilling
you may not be backfilling
he may not be backfilling
we may not be backfilling
you may not be backfilling
they may not be backfilling	I may not have backfilled
you may not have backfilled
he may not have backfilled
we may not have backfilled
you may not have backfilled
they may not have backfilled	I may not have been backfilling
you may not have been backfilling
he 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 	V-ing form 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
may I not backfill?
may you not backfill?
may he not backfill?
may we not backfill?
may you not backfill?
may they not backfill? 	may I not be backfilling?
may you not be backfilling?
may he not be backfilling?
may we not be backfilling?
may you not be backfilling?
may they not be backfilling? 	may I not have backfilled?
may you not have backfilled?
may he not have backfilled?
may we not have backfilled?
may you not have backfilled?
may they not have backfilled? 	may I not have been backfilling?
may you not have been backfilling?
may he not have been backfilling?
may we not have been backfilling?
may you not have been backfilling?
may they not have been backfilling?