I can sire you can sire he can sire we can sire you can sire they can sire
Forma con V-ing
I can be siring you can be siring he can be siring we can be siring you can be siring they can be siring
Perfecto
I can have sired you can have sired he can have sired we can have sired you can have sired they can have sired
Perfecto con V-ing
I can have been siring you can have been siring he can have been siring we can have been siring you can have been siring they can have been siring
Negación
Forma simple
I can't sire you can't sire he can't sire we can't sire you can't sire they can't sire
Forma con V-ing
I can't be siring you can't be siring he can't be siring we can't be siring you can't be siring they can't be siring
Perfecto
I can't have sired you can't have sired he can't have sired we can't have sired you can't have sired they can't have sired
Perfecto con V-ing
I can't have been siring you can't have been siring he can't have been siring we can't have been siring you can't have been siring they can't have been siring
Forma interrogativa
Forma simple
can I sire? can you sire? can he sire? can we sire? can you sire? can they sire?
Forma con V-ing
can I be siring? can you be siring? can he be siring? can we be siring? can you be siring? can they be siring?
Perfecto
can I have sired? can you have sired? can he have sired? can we have sired? can you have sired? can they have sired?
Perfecto con V-ing
can I have been siring? can you have been siring? can he have been siring? can we have been siring? can you have been siring? can they have been siring?
Forma interro-negativa
Forma simple
can't I sire? can't you sire? can't he sire? can't we sire? can't you sire? can't they sire?
Forma con V-ing
can't I be siring? can't you be siring? can't he be siring? can't we be siring? can't you be siring? can't they be siring?
Perfecto
can't I have sired? can't you have sired? can't he have sired? can't we have sired? can't you have sired? can't they have sired?
Perfecto con V-ing
can't I have been siring? can't you have been siring? can't he have been siring? can't we have been siring? can't you have been siring? can't they have been siring?