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