English verb conjugation
COULD BACKFIRE

Regular verb: backfire - backfired - backfired

Affirmation

Simple form	V-ing form
I could backfire you could backfire she could backfire we could backfire you could backfire they could backfire	I could be backfiring you could be backfiring she could be backfiring we could be backfiring you could be backfiring they could be backfiring
Perfect	V-ing perfect
I could have backfired you could have backfired she could have backfired we could have backfired you could have backfired they could have backfired	I could have been backfiring you could have been backfiring she could have been backfiring we could have been backfiring you could have been backfiring they could have been backfiring

Negation

Simple form	V-ing form
I couldn't backfire you couldn't backfire she couldn't backfire we couldn't backfire you couldn't backfire they couldn't backfire	I couldn't be backfiring you couldn't be backfiring she couldn't be backfiring we couldn't be backfiring you couldn't be backfiring they couldn't be backfiring
Perfect	V-ing perfect
I couldn't have backfired you couldn't have backfired she couldn't have backfired we couldn't have backfired you couldn't have backfired they couldn't have backfired	I couldn't have been backfiring you couldn't have been backfiring she couldn't have been backfiring we couldn't have been backfiring you couldn't have been backfiring they couldn't have been backfiring

Interrogative form

Simple form	V-ing form
could I backfire? could you backfire? could she backfire? could we backfire? could you backfire? could they backfire?	could I be backfiring? could you be backfiring? could she be backfiring? could we be backfiring? could you be backfiring? could they be backfiring?
Perfect	V-ing perfect
could I have backfired? could you have backfired? could she have backfired? could we have backfired? could you have backfired? could they have backfired?	could I have been backfiring? could you have been backfiring? could she have been backfiring? could we have been backfiring? could you have been backfiring? could they have been backfiring?

Interro-negative form

Simple form	V-ing form
couldn't I backfire? couldn't you backfire? couldn't she backfire? couldn't we backfire? couldn't you backfire? couldn't they backfire?	couldn't I be backfiring? couldn't you be backfiring? couldn't she be backfiring? couldn't we be backfiring? couldn't you be backfiring? couldn't they be backfiring?
Perfect	V-ing perfect
couldn't I have backfired? couldn't you have backfired? couldn't she have backfired? couldn't we have backfired? couldn't you have backfired? couldn't they have backfired?	couldn't I have been backfiring? couldn't you have been backfiring? couldn't she have been backfiring? couldn't we have been backfiring? couldn't you have been backfiring? couldn't they have been backfiring?