English verb conjugation
SHOULD BACKFILL

Regular verb: backfill - backfilled - backfilled

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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