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