should backfire
Verbo regular: backfire - backfired- backfired

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I should backfire
you should backfire
she should backfire
we should backfire
you should backfire
they should backfire 	I should be backfiring
you should be backfiring
she should be backfiring
we should be backfiring
you should be backfiring
they should be backfiring	I should have backfired
you should have backfired
she should have backfired
we should have backfired
you should have backfired
they should have backfired	I should have been backfiring
you should have been backfiring
she should have been backfiring
we should have been backfiring
you should have been backfiring
they should have been backfiring	

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

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
should I backfire?
should you backfire?
should she backfire?
should we backfire?
should you backfire?
should they backfire? 	should I be backfiring?
should you be backfiring?
should she be backfiring?
should we be backfiring?
should you be backfiring?
should they be backfiring? 	should I have backfired?
should you have backfired?
should she have backfired?
should we have backfired?
should you have backfired?
should they have backfired? 	should I have been backfiring?
should you have been backfiring?
should she have been backfiring?
should we have been backfiring?
should you have been backfiring?
should they have been backfiring? 	

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