must forsake
Irregular verb: forsake - forsook- forsaken

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must forsake
you must forsake
he must forsake
we must forsake
you must forsake
they must forsake 	I must be forsaking
you must be forsaking
he must be forsaking
we must be forsaking
you must be forsaking
they must be forsaking	I must have forsaken
you must have forsaken
he must have forsaken
we must have forsaken
you must have forsaken
they must have forsaken	I must have been forsaking
you must have been forsaking
he must have been forsaking
we must have been forsaking
you must have been forsaking
they must have been forsaking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't forsake
you mustn't forsake
he mustn't forsake
we mustn't forsake
you mustn't forsake
they mustn't forsake 	I mustn't be forsaking
you mustn't be forsaking
he mustn't be forsaking
we mustn't be forsaking
you mustn't be forsaking
they mustn't be forsaking	I mustn't have forsaken
you mustn't have forsaken
he mustn't have forsaken
we mustn't have forsaken
you mustn't have forsaken
they mustn't have forsaken	I mustn't have been forsaking
you mustn't have been forsaking
he mustn't have been forsaking
we mustn't have been forsaking
you mustn't have been forsaking
they mustn't have been forsaking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I forsake?
must you forsake?
must he forsake?
must we forsake?
must you forsake?
must they forsake? 	must I be forsaking?
must you be forsaking?
must he be forsaking?
must we be forsaking?
must you be forsaking?
must they be forsaking? 	must I have forsaken?
must you have forsaken?
must he have forsaken?
must we have forsaken?
must you have forsaken?
must they have forsaken? 	must I have been forsaking?
must you have been forsaking?
must he have been forsaking?
must we have been forsaking?
must you have been forsaking?
must they have been forsaking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I forsake?
mustn't you forsake?
mustn't he forsake?
mustn't we forsake?
mustn't you forsake?
mustn't they forsake? 	mustn't I be forsaking?
mustn't you be forsaking?
mustn't he be forsaking?
mustn't we be forsaking?
mustn't you be forsaking?
mustn't they be forsaking? 	mustn't I have forsaken?
mustn't you have forsaken?
mustn't he have forsaken?
mustn't we have forsaken?
mustn't you have forsaken?
mustn't they have forsaken? 	mustn't I have been forsaking?
mustn't you have been forsaking?
mustn't he have been forsaking?
mustn't we have been forsaking?
mustn't you have been forsaking?
mustn't they have been forsaking?