could sire
Verbo regular: sire - sired- sired

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could sire
you could sire
he could sire
we could sire
you could sire
they could sire 	I could be siring
you could be siring
he could be siring
we could be siring
you could be siring
they could be siring	I could have sired
you could have sired
he could have sired
we could have sired
you could have sired
they could have sired	I could have been siring
you could have been siring
he could have been siring
we could have been siring
you could have been siring
they could have been siring	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not sire
you could not sire
he could not sire
we could not sire
you could not sire
they could not sire 	I could not be siring
you could not be siring
he could not be siring
we could not be siring
you could not be siring
they could not be siring	I could not have sired
you could not have sired
he could not have sired
we could not have sired
you could not have sired
they could not have sired	I could not have been siring
you could not have been siring
he could not have been siring
we could not have been siring
you could not have been siring
they could not have been siring	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I sire?
could you sire?
could he sire?
could we sire?
could you sire?
could they sire? 	could I be siring?
could you be siring?
could he be siring?
could we be siring?
could you be siring?
could they be siring? 	could I have sired?
could you have sired?
could he have sired?
could we have sired?
could you have sired?
could they have sired? 	could I have been siring?
could you have been siring?
could he have been siring?
could we have been siring?
could you have been siring?
could they have been siring? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not sire?
could you not sire?
could he not sire?
could we not sire?
could you not sire?
could they not sire? 	could I not be siring?
could you not be siring?
could he not be siring?
could we not be siring?
could you not be siring?
could they not be siring? 	could I not have sired?
could you not have sired?
could he not have sired?
could we not have sired?
could you not have sired?
could they not have sired? 	could I not have been siring?
could you not have been siring?
could he not have been siring?
could we not have been siring?
could you not have been siring?
could they not have been siring?