English verb conjugation
CAN BACKFIRE

Regular verb: backfire - backfired - backfired

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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