must deceive
Regular verb: deceive - deceived- deceived

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must deceive
you must deceive
he must deceive
we must deceive
you must deceive
they must deceive 	I must be deceiving
you must be deceiving
he must be deceiving
we must be deceiving
you must be deceiving
they must be deceiving	I must have deceived
you must have deceived
he must have deceived
we must have deceived
you must have deceived
they must have deceived	I must have been deceiving
you must have been deceiving
he must have been deceiving
we must have been deceiving
you must have been deceiving
they must have been deceiving	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't deceive
you mustn't deceive
he mustn't deceive
we mustn't deceive
you mustn't deceive
they mustn't deceive 	I mustn't be deceiving
you mustn't be deceiving
he mustn't be deceiving
we mustn't be deceiving
you mustn't be deceiving
they mustn't be deceiving	I mustn't have deceived
you mustn't have deceived
he mustn't have deceived
we mustn't have deceived
you mustn't have deceived
they mustn't have deceived	I mustn't have been deceiving
you mustn't have been deceiving
he mustn't have been deceiving
we mustn't have been deceiving
you mustn't have been deceiving
they mustn't have been deceiving	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I deceive?
must you deceive?
must he deceive?
must we deceive?
must you deceive?
must they deceive? 	must I be deceiving?
must you be deceiving?
must he be deceiving?
must we be deceiving?
must you be deceiving?
must they be deceiving? 	must I have deceived?
must you have deceived?
must he have deceived?
must we have deceived?
must you have deceived?
must they have deceived? 	must I have been deceiving?
must you have been deceiving?
must he have been deceiving?
must we have been deceiving?
must you have been deceiving?
must they have been deceiving? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I deceive?
mustn't you deceive?
mustn't he deceive?
mustn't we deceive?
mustn't you deceive?
mustn't they deceive? 	mustn't I be deceiving?
mustn't you be deceiving?
mustn't he be deceiving?
mustn't we be deceiving?
mustn't you be deceiving?
mustn't they be deceiving? 	mustn't I have deceived?
mustn't you have deceived?
mustn't he have deceived?
mustn't we have deceived?
mustn't you have deceived?
mustn't they have deceived? 	mustn't I have been deceiving?
mustn't you have been deceiving?
mustn't he have been deceiving?
mustn't we have been deceiving?
mustn't you have been deceiving?
mustn't they have been deceiving?