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 cannot backfire you cannot backfire he cannot backfire we cannot backfire you cannot backfire they cannot backfire	I cannot be backfiring you cannot be backfiring he cannot be backfiring we cannot be backfiring you cannot be backfiring they cannot be backfiring
Perfect	V-ing perfect
I cannot have backfired you cannot have backfired he cannot have backfired we cannot have backfired you cannot have backfired they cannot have backfired	I cannot have been backfiring you cannot have been backfiring he cannot have been backfiring we cannot have been backfiring you cannot have been backfiring they cannot 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 I not backfire? can you not backfire? can he not backfire? can we not backfire? can you not backfire? can they not backfire?	can I not be backfiring? can you not be backfiring? can he not be backfiring? can we not be backfiring? can you not be backfiring? can they not be backfiring?
Perfect	V-ing perfect
can I not have backfired? can you not have backfired? can he not have backfired? can we not have backfired? can you not have backfired? can they not have backfired?	can I not have been backfiring? can you not have been backfiring? can he not have been backfiring? can we not have been backfiring? can you not have been backfiring? can they not have been backfiring?