must decoy
Regular verb: decoy - decoyed- decoyed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must decoy
you must decoy
he must decoy
we must decoy
you must decoy
they must decoy 	I must be decoying
you must be decoying
he must be decoying
we must be decoying
you must be decoying
they must be decoying	I must have decoyed
you must have decoyed
he must have decoyed
we must have decoyed
you must have decoyed
they must have decoyed	I must have been decoying
you must have been decoying
he must have been decoying
we must have been decoying
you must have been decoying
they must have been decoying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't decoy
you mustn't decoy
he mustn't decoy
we mustn't decoy
you mustn't decoy
they mustn't decoy 	I mustn't be decoying
you mustn't be decoying
he mustn't be decoying
we mustn't be decoying
you mustn't be decoying
they mustn't be decoying	I mustn't have decoyed
you mustn't have decoyed
he mustn't have decoyed
we mustn't have decoyed
you mustn't have decoyed
they mustn't have decoyed	I mustn't have been decoying
you mustn't have been decoying
he mustn't have been decoying
we mustn't have been decoying
you mustn't have been decoying
they mustn't have been decoying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I decoy?
must you decoy?
must he decoy?
must we decoy?
must you decoy?
must they decoy? 	must I be decoying?
must you be decoying?
must he be decoying?
must we be decoying?
must you be decoying?
must they be decoying? 	must I have decoyed?
must you have decoyed?
must he have decoyed?
must we have decoyed?
must you have decoyed?
must they have decoyed? 	must I have been decoying?
must you have been decoying?
must he have been decoying?
must we have been decoying?
must you have been decoying?
must they have been decoying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I decoy?
mustn't you decoy?
mustn't he decoy?
mustn't we decoy?
mustn't you decoy?
mustn't they decoy? 	mustn't I be decoying?
mustn't you be decoying?
mustn't he be decoying?
mustn't we be decoying?
mustn't you be decoying?
mustn't they be decoying? 	mustn't I have decoyed?
mustn't you have decoyed?
mustn't he have decoyed?
mustn't we have decoyed?
mustn't you have decoyed?
mustn't they have decoyed? 	mustn't I have been decoying?
mustn't you have been decoying?
mustn't he have been decoying?
mustn't we have been decoying?
mustn't you have been decoying?
mustn't they have been decoying?