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