could backfire
Verbo regular: backfire - backfired- backfired

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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	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	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not backfire
you could not backfire
she could not backfire
we could not backfire
you could not backfire
they could not backfire 	I could not be backfiring
you could not be backfiring
she could not be backfiring
we could not be backfiring
you could not be backfiring
they could not be backfiring	I could not have backfired
you could not have backfired
she could not have backfired
we could not have backfired
you could not have backfired
they could not have backfired	I could not have been backfiring
you could not have been backfiring
she could not have been backfiring
we could not have been backfiring
you could not have been backfiring
they could not have been backfiring	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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? 	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? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not backfire?
could you not backfire?
could she not backfire?
could we not backfire?
could you not backfire?
could they not backfire? 	could I not be backfiring?
could you not be backfiring?
could she not be backfiring?
could we not be backfiring?
could you not be backfiring?
could they not be backfiring? 	could I not have backfired?
could you not have backfired?
could she not have backfired?
could we not have backfired?
could you not have backfired?
could they not have backfired? 	could I not have been backfiring?
could you not have been backfiring?
could she not have been backfiring?
could we not have been backfiring?
could you not have been backfiring?
could they not have been backfiring?