I could deceive you could deceive she could deceive we could deceive you could deceive they could deceive
V-ing form
I could be deceiving you could be deceiving she could be deceiving we could be deceiving you could be deceiving they could be deceiving
Perfect
I could have deceived you could have deceived she could have deceived we could have deceived you could have deceived they could have deceived
V-ing perfect
I could have been deceiving you could have been deceiving she could have been deceiving we could have been deceiving you could have been deceiving they could have been deceiving
Negation
Simple form
I could not deceive you could not deceive she could not deceive we could not deceive you could not deceive they could not deceive
V-ing form
I could not be deceiving you could not be deceiving she could not be deceiving we could not be deceiving you could not be deceiving they could not be deceiving
Perfect
I could not have deceived you could not have deceived she could not have deceived we could not have deceived you could not have deceived they could not have deceived
V-ing perfect
I could not have been deceiving you could not have been deceiving she could not have been deceiving we could not have been deceiving you could not have been deceiving they could not have been deceiving
Interrogative form
Simple form
could I deceive? could you deceive? could she deceive? could we deceive? could you deceive? could they deceive?
V-ing form
could I be deceiving? could you be deceiving? could she be deceiving? could we be deceiving? could you be deceiving? could they be deceiving?
Perfect
could I have deceived? could you have deceived? could she have deceived? could we have deceived? could you have deceived? could they have deceived?
V-ing perfect
could I have been deceiving? could you have been deceiving? could she have been deceiving? could we have been deceiving? could you have been deceiving? could they have been deceiving?
Interro-negative form
Simple form
could I not deceive? could you not deceive? could she not deceive? could we not deceive? could you not deceive? could they not deceive?
V-ing form
could I not be deceiving? could you not be deceiving? could she not be deceiving? could we not be deceiving? could you not be deceiving? could they not be deceiving?
Perfect
could I not have deceived? could you not have deceived? could she not have deceived? could we not have deceived? could you not have deceived? could they not have deceived?
V-ing perfect
could I not have been deceiving? could you not have been deceiving? could she not have been deceiving? could we not have been deceiving? could you not have been deceiving? could they not have been deceiving?