I can scan you can scan he can scan we can scan you can scan they can scan
V-ing form
I can be scanning you can be scanning he can be scanning we can be scanning you can be scanning they can be scanning
Perfect
I can have scanned you can have scanned he can have scanned we can have scanned you can have scanned they can have scanned
V-ing perfect
I can have been scanning you can have been scanning he can have been scanning we can have been scanning you can have been scanning they can have been scanning
Negation
Simple form
I can't scan you can't scan he can't scan we can't scan you can't scan they can't scan
V-ing form
I can't be scanning you can't be scanning he can't be scanning we can't be scanning you can't be scanning they can't be scanning
Perfect
I can't have scanned you can't have scanned he can't have scanned we can't have scanned you can't have scanned they can't have scanned
V-ing perfect
I can't have been scanning you can't have been scanning he can't have been scanning we can't have been scanning you can't have been scanning they can't have been scanning
Interrogative form
Simple form
can I scan? can you scan? can he scan? can we scan? can you scan? can they scan?
V-ing form
can I be scanning? can you be scanning? can he be scanning? can we be scanning? can you be scanning? can they be scanning?
Perfect
can I have scanned? can you have scanned? can he have scanned? can we have scanned? can you have scanned? can they have scanned?
V-ing perfect
can I have been scanning? can you have been scanning? can he have been scanning? can we have been scanning? can you have been scanning? can they have been scanning?
Interro-negative form
Simple form
can't I scan? can't you scan? can't he scan? can't we scan? can't you scan? can't they scan?
V-ing form
can't I be scanning? can't you be scanning? can't he be scanning? can't we be scanning? can't you be scanning? can't they be scanning?
Perfect
can't I have scanned? can't you have scanned? can't he have scanned? can't we have scanned? can't you have scanned? can't they have scanned?
V-ing perfect
can't I have been scanning? can't you have been scanning? can't he have been scanning? can't we have been scanning? can't you have been scanning? can't they have been scanning?