English verb conjugation
COULD SCAN

Regular verb: scan - scanned - scanned

Affirmation

Simple form	V-ing form
I could scan you could scan he could scan we could scan you could scan they could scan	I could be scanning you could be scanning he could be scanning we could be scanning you could be scanning they could be scanning
Perfect	V-ing perfect
I could have scanned you could have scanned he could have scanned we could have scanned you could have scanned they could have scanned	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

Negation

Simple form	V-ing form
I couldn't scan you couldn't scan he couldn't scan we couldn't scan you couldn't scan they couldn't scan	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
Perfect	V-ing perfect
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	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

Interrogative form

Simple form	V-ing form
could I scan? could you scan? could he scan? could we scan? could you scan? could they scan?	could I be scanning? could you be scanning? could he be scanning? could we be scanning? could you be scanning? could they be scanning?
Perfect	V-ing perfect
could I have scanned? could you have scanned? could he have scanned? could we have scanned? could you have scanned? could they have scanned?	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?

Interro-negative form

Simple form	V-ing form
couldn't I scan? couldn't you scan? couldn't he scan? couldn't we scan? couldn't you scan? couldn't they scan?	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?
Perfect	V-ing perfect
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?	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?