could deceive
Regular verb: deceive - deceived- deceived

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could deceive
you could deceive
she could deceive
we could deceive
you could deceive
they could deceive 	I could be deceiving
you could be deceiving
she could be deceiving
we could be deceiving
you could be deceiving
they could be deceiving	I could have deceived
you could have deceived
she could have deceived
we could have deceived
you could have deceived
they could have deceived	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 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't deceive
you couldn't deceive
she couldn't deceive
we couldn't deceive
you couldn't deceive
they couldn't deceive 	I couldn't be deceiving
you couldn't be deceiving
she couldn't be deceiving
we couldn't be deceiving
you couldn't be deceiving
they couldn't be deceiving	I couldn't have deceived
you couldn't have deceived
she couldn't have deceived
we couldn't have deceived
you couldn't have deceived
they couldn't have deceived	I couldn't have been deceiving
you couldn't have been deceiving
she couldn't have been deceiving
we couldn't have been deceiving
you couldn't have been deceiving
they couldn't have been deceiving	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I deceive?
could you deceive?
could she deceive?
could we deceive?
could you deceive?
could they deceive? 	could I be deceiving?
could you be deceiving?
could she be deceiving?
could we be deceiving?
could you be deceiving?
could they be deceiving? 	could I have deceived?
could you have deceived?
could she have deceived?
could we have deceived?
could you have deceived?
could they have deceived? 	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 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I deceive?
couldn't you deceive?
couldn't she deceive?
couldn't we deceive?
couldn't you deceive?
couldn't they deceive? 	couldn't I be deceiving?
couldn't you be deceiving?
couldn't she be deceiving?
couldn't we be deceiving?
couldn't you be deceiving?
couldn't they be deceiving? 	couldn't I have deceived?
couldn't you have deceived?
couldn't she have deceived?
couldn't we have deceived?
couldn't you have deceived?
couldn't they have deceived? 	couldn't I have been deceiving?
couldn't you have been deceiving?
couldn't she have been deceiving?
couldn't we have been deceiving?
couldn't you have been deceiving?
couldn't they have been deceiving?