I could dart you could dart she could dart we could dart you could dart they could dart
V-ing form
I could be darting you could be darting she could be darting we could be darting you could be darting they could be darting
Perfect
I could have darted you could have darted she could have darted we could have darted you could have darted they could have darted
V-ing perfect
I could have been darting you could have been darting she could have been darting we could have been darting you could have been darting they could have been darting
Negation
Simple form
I could not dart you could not dart she could not dart we could not dart you could not dart they could not dart
V-ing form
I could not be darting you could not be darting she could not be darting we could not be darting you could not be darting they could not be darting
Perfect
I could not have darted you could not have darted she could not have darted we could not have darted you could not have darted they could not have darted
V-ing perfect
I could not have been darting you could not have been darting she could not have been darting we could not have been darting you could not have been darting they could not have been darting
Interrogative form
Simple form
could I dart? could you dart? could she dart? could we dart? could you dart? could they dart?
V-ing form
could I be darting? could you be darting? could she be darting? could we be darting? could you be darting? could they be darting?
Perfect
could I have darted? could you have darted? could she have darted? could we have darted? could you have darted? could they have darted?
V-ing perfect
could I have been darting? could you have been darting? could she have been darting? could we have been darting? could you have been darting? could they have been darting?
Interro-negative form
Simple form
could I not dart? could you not dart? could she not dart? could we not dart? could you not dart? could they not dart?
V-ing form
could I not be darting? could you not be darting? could she not be darting? could we not be darting? could you not be darting? could they not be darting?
Perfect
could I not have darted? could you not have darted? could she not have darted? could we not have darted? could you not have darted? could they not have darted?
V-ing perfect
could I not have been darting? could you not have been darting? could she not have been darting? could we not have been darting? could you not have been darting? could they not have been darting?