I could doubt you could doubt she could doubt we could doubt you could doubt they could doubt
Forma con V-ing
I could be doubting you could be doubting she could be doubting we could be doubting you could be doubting they could be doubting
Perfecto
I could have doubted you could have doubted she could have doubted we could have doubted you could have doubted they could have doubted
Perfecto con V-ing
I could have been doubting you could have been doubting she could have been doubting we could have been doubting you could have been doubting they could have been doubting
Negación
Forma simple
I couldn't doubt you couldn't doubt she couldn't doubt we couldn't doubt you couldn't doubt they couldn't doubt
Forma con V-ing
I couldn't be doubting you couldn't be doubting she couldn't be doubting we couldn't be doubting you couldn't be doubting they couldn't be doubting
Perfecto
I couldn't have doubted you couldn't have doubted she couldn't have doubted we couldn't have doubted you couldn't have doubted they couldn't have doubted
Perfecto con V-ing
I couldn't have been doubting you couldn't have been doubting she couldn't have been doubting we couldn't have been doubting you couldn't have been doubting they couldn't have been doubting
Forma interrogativa
Forma simple
could I doubt? could you doubt? could she doubt? could we doubt? could you doubt? could they doubt?
Forma con V-ing
could I be doubting? could you be doubting? could she be doubting? could we be doubting? could you be doubting? could they be doubting?
Perfecto
could I have doubted? could you have doubted? could she have doubted? could we have doubted? could you have doubted? could they have doubted?
Perfecto con V-ing
could I have been doubting? could you have been doubting? could she have been doubting? could we have been doubting? could you have been doubting? could they have been doubting?
Forma interro-negativa
Forma simple
couldn't I doubt? couldn't you doubt? couldn't she doubt? couldn't we doubt? couldn't you doubt? couldn't they doubt?
Forma con V-ing
couldn't I be doubting? couldn't you be doubting? couldn't she be doubting? couldn't we be doubting? couldn't you be doubting? couldn't they be doubting?
Perfecto
couldn't I have doubted? couldn't you have doubted? couldn't she have doubted? couldn't we have doubted? couldn't you have doubted? couldn't they have doubted?
Perfecto con V-ing
couldn't I have been doubting? couldn't you have been doubting? couldn't she have been doubting? couldn't we have been doubting? couldn't you have been doubting? couldn't they have been doubting?