must deceive
Regular verb: deceive - deceived- deceived

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