English verb conjugation COULD BACKFILL

Regular verb: backfill - backfilled - backfilled

Affirmation

Simple form

I could backfill
you could backfill
he could backfill
we could backfill
you could backfill
they could backfill

V-ing form

I could be backfilling
you could be backfilling
he could be backfilling
we could be backfilling
you could be backfilling
they could be backfilling

Perfect

I could have backfilled
you could have backfilled
he could have backfilled
we could have backfilled
you could have backfilled
they could have backfilled

V-ing perfect

I could have been backfilling
you could have been backfilling
he could have been backfilling
we could have been backfilling
you could have been backfilling
they could have been backfilling

Negation

Simple form

I couldn't backfill
you couldn't backfill
he couldn't backfill
we couldn't backfill
you couldn't backfill
they couldn't backfill

V-ing form

I couldn't be backfilling
you couldn't be backfilling
he couldn't be backfilling
we couldn't be backfilling
you couldn't be backfilling
they couldn't be backfilling

Perfect

I couldn't have backfilled
you couldn't have backfilled
he couldn't have backfilled
we couldn't have backfilled
you couldn't have backfilled
they couldn't have backfilled

V-ing perfect

I couldn't have been backfilling
you couldn't have been backfilling
he couldn't have been backfilling
we couldn't have been backfilling
you couldn't have been backfilling
they couldn't have been backfilling

Interrogative form

Simple form

could I backfill?
could you backfill?
could he backfill?
could we backfill?
could you backfill?
could they backfill?

V-ing form

could I be backfilling?
could you be backfilling?
could he be backfilling?
could we be backfilling?
could you be backfilling?
could they be backfilling?

Perfect

could I have backfilled?
could you have backfilled?
could he have backfilled?
could we have backfilled?
could you have backfilled?
could they have backfilled?

V-ing perfect

could I have been backfilling?
could you have been backfilling?
could he have been backfilling?
could we have been backfilling?
could you have been backfilling?
could they have been backfilling?

Interro-negative form

Simple form

couldn't I backfill?
couldn't you backfill?
couldn't he backfill?
couldn't we backfill?
couldn't you backfill?
couldn't they backfill?

V-ing form

couldn't I be backfilling?
couldn't you be backfilling?
couldn't he be backfilling?
couldn't we be backfilling?
couldn't you be backfilling?
couldn't they be backfilling?

Perfect

couldn't I have backfilled?
couldn't you have backfilled?
couldn't he have backfilled?
couldn't we have backfilled?
couldn't you have backfilled?
couldn't they have backfilled?

V-ing perfect

couldn't I have been backfilling?
couldn't you have been backfilling?
couldn't he have been backfilling?
couldn't we have been backfilling?
couldn't you have been backfilling?
couldn't they have been backfilling?

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