can backfire
Regular verb: backfire - backfired- backfired

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?