must effect
Regular verb: effect - effected- effected

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must effect
you must effect
he must effect
we must effect
you must effect
they must effect 	I must be effecting
you must be effecting
he must be effecting
we must be effecting
you must be effecting
they must be effecting	I must have effected
you must have effected
he must have effected
we must have effected
you must have effected
they must have effected	I must have been effecting
you must have been effecting
he must have been effecting
we must have been effecting
you must have been effecting
they must have been effecting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't effect
you mustn't effect
he mustn't effect
we mustn't effect
you mustn't effect
they mustn't effect 	I mustn't be effecting
you mustn't be effecting
he mustn't be effecting
we mustn't be effecting
you mustn't be effecting
they mustn't be effecting	I mustn't have effected
you mustn't have effected
he mustn't have effected
we mustn't have effected
you mustn't have effected
they mustn't have effected	I mustn't have been effecting
you mustn't have been effecting
he mustn't have been effecting
we mustn't have been effecting
you mustn't have been effecting
they mustn't have been effecting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I effect?
must you effect?
must he effect?
must we effect?
must you effect?
must they effect? 	must I be effecting?
must you be effecting?
must he be effecting?
must we be effecting?
must you be effecting?
must they be effecting? 	must I have effected?
must you have effected?
must he have effected?
must we have effected?
must you have effected?
must they have effected? 	must I have been effecting?
must you have been effecting?
must he have been effecting?
must we have been effecting?
must you have been effecting?
must they have been effecting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I effect?
mustn't you effect?
mustn't he effect?
mustn't we effect?
mustn't you effect?
mustn't they effect? 	mustn't I be effecting?
mustn't you be effecting?
mustn't he be effecting?
mustn't we be effecting?
mustn't you be effecting?
mustn't they be effecting? 	mustn't I have effected?
mustn't you have effected?
mustn't he have effected?
mustn't we have effected?
mustn't you have effected?
mustn't they have effected? 	mustn't I have been effecting?
mustn't you have been effecting?
mustn't he have been effecting?
mustn't we have been effecting?
mustn't you have been effecting?
mustn't they have been effecting?