must defect
Regular verb: defect - defected- defected

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must defect
you must defect
he must defect
we must defect
you must defect
they must defect 	I must be defecting
you must be defecting
he must be defecting
we must be defecting
you must be defecting
they must be defecting	I must have defected
you must have defected
he must have defected
we must have defected
you must have defected
they must have defected	I must have been defecting
you must have been defecting
he must have been defecting
we must have been defecting
you must have been defecting
they must have been defecting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't defect
you mustn't defect
he mustn't defect
we mustn't defect
you mustn't defect
they mustn't defect 	I mustn't be defecting
you mustn't be defecting
he mustn't be defecting
we mustn't be defecting
you mustn't be defecting
they mustn't be defecting	I mustn't have defected
you mustn't have defected
he mustn't have defected
we mustn't have defected
you mustn't have defected
they mustn't have defected	I mustn't have been defecting
you mustn't have been defecting
he mustn't have been defecting
we mustn't have been defecting
you mustn't have been defecting
they mustn't have been defecting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I defect?
must you defect?
must he defect?
must we defect?
must you defect?
must they defect? 	must I be defecting?
must you be defecting?
must he be defecting?
must we be defecting?
must you be defecting?
must they be defecting? 	must I have defected?
must you have defected?
must he have defected?
must we have defected?
must you have defected?
must they have defected? 	must I have been defecting?
must you have been defecting?
must he have been defecting?
must we have been defecting?
must you have been defecting?
must they have been defecting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I defect?
mustn't you defect?
mustn't he defect?
mustn't we defect?
mustn't you defect?
mustn't they defect? 	mustn't I be defecting?
mustn't you be defecting?
mustn't he be defecting?
mustn't we be defecting?
mustn't you be defecting?
mustn't they be defecting? 	mustn't I have defected?
mustn't you have defected?
mustn't he have defected?
mustn't we have defected?
mustn't you have defected?
mustn't they have defected? 	mustn't I have been defecting?
mustn't you have been defecting?
mustn't he have been defecting?
mustn't we have been defecting?
mustn't you have been defecting?
mustn't they have been defecting?