must exchange
Regular verb: exchange - exchanged- exchanged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must exchange
you must exchange
she must exchange
we must exchange
you must exchange
they must exchange 	I must be exchanging
you must be exchanging
she must be exchanging
we must be exchanging
you must be exchanging
they must be exchanging	I must have exchanged
you must have exchanged
she must have exchanged
we must have exchanged
you must have exchanged
they must have exchanged	I must have been exchanging
you must have been exchanging
she must have been exchanging
we must have been exchanging
you must have been exchanging
they must have been exchanging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't exchange
you mustn't exchange
she mustn't exchange
we mustn't exchange
you mustn't exchange
they mustn't exchange 	I mustn't be exchanging
you mustn't be exchanging
she mustn't be exchanging
we mustn't be exchanging
you mustn't be exchanging
they mustn't be exchanging	I mustn't have exchanged
you mustn't have exchanged
she mustn't have exchanged
we mustn't have exchanged
you mustn't have exchanged
they mustn't have exchanged	I mustn't have been exchanging
you mustn't have been exchanging
she mustn't have been exchanging
we mustn't have been exchanging
you mustn't have been exchanging
they mustn't have been exchanging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I exchange?
must you exchange?
must she exchange?
must we exchange?
must you exchange?
must they exchange? 	must I be exchanging?
must you be exchanging?
must she be exchanging?
must we be exchanging?
must you be exchanging?
must they be exchanging? 	must I have exchanged?
must you have exchanged?
must she have exchanged?
must we have exchanged?
must you have exchanged?
must they have exchanged? 	must I have been exchanging?
must you have been exchanging?
must she have been exchanging?
must we have been exchanging?
must you have been exchanging?
must they have been exchanging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I exchange?
mustn't you exchange?
mustn't she exchange?
mustn't we exchange?
mustn't you exchange?
mustn't they exchange? 	mustn't I be exchanging?
mustn't you be exchanging?
mustn't she be exchanging?
mustn't we be exchanging?
mustn't you be exchanging?
mustn't they be exchanging? 	mustn't I have exchanged?
mustn't you have exchanged?
mustn't she have exchanged?
mustn't we have exchanged?
mustn't you have exchanged?
mustn't they have exchanged? 	mustn't I have been exchanging?
mustn't you have been exchanging?
mustn't she have been exchanging?
mustn't we have been exchanging?
mustn't you have been exchanging?
mustn't they have been exchanging?