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