will backfill
Regular verb: backfill - backfilled- backfilled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I will backfill
you will backfill
she will backfill
we will backfill
you will backfill
they will backfill 	I will be backfilling
you will be backfilling
she will be backfilling
we will be backfilling
you will be backfilling
they will be backfilling	I will have backfilled
you will have backfilled
she will have backfilled
we will have backfilled
you will have backfilled
they will have backfilled	I will have been backfilling
you will have been backfilling
she will have been backfilling
we will have been backfilling
you will have been backfilling
they will have been backfilling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I will not backfill
you will not backfill
she will not backfill
we will not backfill
you will not backfill
they will not backfill 	I will not be backfilling
you will not be backfilling
she will not be backfilling
we will not be backfilling
you will not be backfilling
they will not be backfilling	I will not have backfilled
you will not have backfilled
she will not have backfilled
we will not have backfilled
you will not have backfilled
they will not have backfilled	I will not have been backfilling
you will not have been backfilling
she will not have been backfilling
we will not have been backfilling
you will not have been backfilling
they will not have been backfilling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
will I backfill?
will you backfill?
will she backfill?
will we backfill?
will you backfill?
will they backfill? 	will I be backfilling?
will you be backfilling?
will she be backfilling?
will we be backfilling?
will you be backfilling?
will they be backfilling? 	will I have backfilled?
will you have backfilled?
will she have backfilled?
will we have backfilled?
will you have backfilled?
will they have backfilled? 	will I have been backfilling?
will you have been backfilling?
will she have been backfilling?
will we have been backfilling?
will you have been backfilling?
will they have been backfilling? 	

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