I could sire you could sire he could sire we could sire you could sire they could sire
Forma com V-ing
I could be siring you could be siring he could be siring we could be siring you could be siring they could be siring
Perfeito
I could have sired you could have sired he could have sired we could have sired you could have sired they could have sired
Perfeito com V-ing
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
I couldn't sire you couldn't sire he couldn't sire we couldn't sire you couldn't sire they couldn't sire
Forma com V-ing
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
Perfeito
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
Perfeito com V-ing
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
could I sire? could you sire? could he sire? could we sire? could you sire? could they sire?
Forma com V-ing
could I be siring? could you be siring? could he be siring? could we be siring? could you be siring? could they be siring?
Perfeito
could I have sired? could you have sired? could he have sired? could we have sired? could you have sired? could they have sired?
Perfeito com V-ing
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
couldn't I sire? couldn't you sire? couldn't he sire? couldn't we sire? couldn't you sire? couldn't they sire?
Forma com V-ing
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?
Perfeito
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?
Perfeito com V-ing
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?