English verb conjugation
CAN SCAN

Regular verb: scan - scanned - scanned

Affirmation

Simple form	V-ing form
I can scan you can scan he can scan we can scan you can scan they can scan	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	V-ing 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	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	V-ing 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	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	V-ing 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	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	V-ing form
can I scan? can you scan? can he scan? can we scan? can you scan? can they scan?	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	V-ing 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?	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	V-ing 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?	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	V-ing 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?	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?