I could dot you could dot she could dot we could dot you could dot they could dot
V-ing form
I could be dotting you could be dotting she could be dotting we could be dotting you could be dotting they could be dotting
Perfect
I could have dotted you could have dotted she could have dotted we could have dotted you could have dotted they could have dotted
V-ing perfect
I could have been dotting you could have been dotting she could have been dotting we could have been dotting you could have been dotting they could have been dotting
Negation
Simple form
I could not dot you could not dot she could not dot we could not dot you could not dot they could not dot
V-ing form
I could not be dotting you could not be dotting she could not be dotting we could not be dotting you could not be dotting they could not be dotting
Perfect
I could not have dotted you could not have dotted she could not have dotted we could not have dotted you could not have dotted they could not have dotted
V-ing perfect
I could not have been dotting you could not have been dotting she could not have been dotting we could not have been dotting you could not have been dotting they could not have been dotting
Interrogative form
Simple form
could I dot? could you dot? could she dot? could we dot? could you dot? could they dot?
V-ing form
could I be dotting? could you be dotting? could she be dotting? could we be dotting? could you be dotting? could they be dotting?
Perfect
could I have dotted? could you have dotted? could she have dotted? could we have dotted? could you have dotted? could they have dotted?
V-ing perfect
could I have been dotting? could you have been dotting? could she have been dotting? could we have been dotting? could you have been dotting? could they have been dotting?
Interro-negative form
Simple form
could I not dot? could you not dot? could she not dot? could we not dot? could you not dot? could they not dot?
V-ing form
could I not be dotting? could you not be dotting? could she not be dotting? could we not be dotting? could you not be dotting? could they not be dotting?
Perfect
could I not have dotted? could you not have dotted? could she not have dotted? could we not have dotted? could you not have dotted? could they not have dotted?
V-ing perfect
could I not have been dotting? could you not have been dotting? could she not have been dotting? could we not have been dotting? could you not have been dotting? could they not have been dotting?