Conjugación del verbo inglés
COULD SIRE

Verbo regular: sire - sired - sired

Afirmación

Forma simple	Forma con 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
Perfecto	Perfecto con V-ing
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

Negación

Forma simple	Forma con V-ing
I couldn't sire you couldn't sire he couldn't sire we couldn't sire you couldn't sire they couldn't sire	I couldn't be siring you couldn't be siring he couldn't be siring we couldn't be siring you couldn't be siring they couldn't be siring
Perfecto	Perfecto con V-ing
I couldn't have sired you couldn't have sired he couldn't have sired we couldn't have sired you couldn't have sired they couldn't have sired	I couldn't have been siring you couldn't have been siring he couldn't have been siring we couldn't have been siring you couldn't have been siring they couldn't have been siring

Forma interrogativa

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

Forma simple	Forma con V-ing
couldn't I sire? couldn't you sire? couldn't he sire? couldn't we sire? couldn't you sire? couldn't they sire?	couldn't I be siring? couldn't you be siring? couldn't he be siring? couldn't we be siring? couldn't you be siring? couldn't they be siring?
Perfecto	Perfecto con V-ing
couldn't I have sired? couldn't you have sired? couldn't he have sired? couldn't we have sired? couldn't you have sired? couldn't they have sired?	couldn't I have been siring? couldn't you have been siring? couldn't he have been siring? couldn't we have been siring? couldn't you have been siring? couldn't they have been siring?