must foist
Regular verb: foist - foisted- foisted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must foist
you must foist
he must foist
we must foist
you must foist
they must foist 	I must be foisting
you must be foisting
he must be foisting
we must be foisting
you must be foisting
they must be foisting	I must have foisted
you must have foisted
he must have foisted
we must have foisted
you must have foisted
they must have foisted	I must have been foisting
you must have been foisting
he must have been foisting
we must have been foisting
you must have been foisting
they must have been foisting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't foist
you mustn't foist
he mustn't foist
we mustn't foist
you mustn't foist
they mustn't foist 	I mustn't be foisting
you mustn't be foisting
he mustn't be foisting
we mustn't be foisting
you mustn't be foisting
they mustn't be foisting	I mustn't have foisted
you mustn't have foisted
he mustn't have foisted
we mustn't have foisted
you mustn't have foisted
they mustn't have foisted	I mustn't have been foisting
you mustn't have been foisting
he mustn't have been foisting
we mustn't have been foisting
you mustn't have been foisting
they mustn't have been foisting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I foist?
must you foist?
must he foist?
must we foist?
must you foist?
must they foist? 	must I be foisting?
must you be foisting?
must he be foisting?
must we be foisting?
must you be foisting?
must they be foisting? 	must I have foisted?
must you have foisted?
must he have foisted?
must we have foisted?
must you have foisted?
must they have foisted? 	must I have been foisting?
must you have been foisting?
must he have been foisting?
must we have been foisting?
must you have been foisting?
must they have been foisting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I foist?
mustn't you foist?
mustn't he foist?
mustn't we foist?
mustn't you foist?
mustn't they foist? 	mustn't I be foisting?
mustn't you be foisting?
mustn't he be foisting?
mustn't we be foisting?
mustn't you be foisting?
mustn't they be foisting? 	mustn't I have foisted?
mustn't you have foisted?
mustn't he have foisted?
mustn't we have foisted?
mustn't you have foisted?
mustn't they have foisted? 	mustn't I have been foisting?
mustn't you have been foisting?
mustn't he have been foisting?
mustn't we have been foisting?
mustn't you have been foisting?
mustn't they have been foisting?