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