I could expand you could expand he could expand we could expand you could expand they could expand
Forma con V-ing
I could be expanding you could be expanding he could be expanding we could be expanding you could be expanding they could be expanding
Perfecto
I could have expanded you could have expanded he could have expanded we could have expanded you could have expanded they could have expanded
Perfecto con V-ing
I could have been expanding you could have been expanding he could have been expanding we could have been expanding you could have been expanding they could have been expanding
Negación
Forma simple
I couldn't expand you couldn't expand he couldn't expand we couldn't expand you couldn't expand they couldn't expand
Forma con V-ing
I couldn't be expanding you couldn't be expanding he couldn't be expanding we couldn't be expanding you couldn't be expanding they couldn't be expanding
Perfecto
I couldn't have expanded you couldn't have expanded he couldn't have expanded we couldn't have expanded you couldn't have expanded they couldn't have expanded
Perfecto con V-ing
I couldn't have been expanding you couldn't have been expanding he couldn't have been expanding we couldn't have been expanding you couldn't have been expanding they couldn't have been expanding
Forma interrogativa
Forma simple
could I expand? could you expand? could he expand? could we expand? could you expand? could they expand?
Forma con V-ing
could I be expanding? could you be expanding? could he be expanding? could we be expanding? could you be expanding? could they be expanding?
Perfecto
could I have expanded? could you have expanded? could he have expanded? could we have expanded? could you have expanded? could they have expanded?
Perfecto con V-ing
could I have been expanding? could you have been expanding? could he have been expanding? could we have been expanding? could you have been expanding? could they have been expanding?
Forma interro-negativa
Forma simple
couldn't I expand? couldn't you expand? couldn't he expand? couldn't we expand? couldn't you expand? couldn't they expand?
Forma con V-ing
couldn't I be expanding? couldn't you be expanding? couldn't he be expanding? couldn't we be expanding? couldn't you be expanding? couldn't they be expanding?
Perfecto
couldn't I have expanded? couldn't you have expanded? couldn't he have expanded? couldn't we have expanded? couldn't you have expanded? couldn't they have expanded?
Perfecto con V-ing
couldn't I have been expanding? couldn't you have been expanding? couldn't he have been expanding? couldn't we have been expanding? couldn't you have been expanding? couldn't they have been expanding?