can backfire
Regular verb: backfire - backfired- backfired

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