must exchange
Verbo regular: exchange - exchanged- exchanged

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must exchange
you must exchange
he must exchange
we must exchange
you must exchange
they must exchange 	I must be exchanging
you must be exchanging
he must be exchanging
we must be exchanging
you must be exchanging
they must be exchanging	I must have exchanged
you must have exchanged
he 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
he must have been exchanging
we must have been exchanging
you must have been exchanging
they must have been exchanging	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't exchange
you mustn't exchange
he 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
he 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
he 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
he mustn't have been exchanging
we mustn't have been exchanging
you mustn't have been exchanging
they mustn't have been exchanging	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I exchange?
must you exchange?
must he exchange?
must we exchange?
must you exchange?
must they exchange? 	must I be exchanging?
must you be exchanging?
must he be exchanging?
must we be exchanging?
must you be exchanging?
must they be exchanging? 	must I have exchanged?
must you have exchanged?
must he 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 he have been exchanging?
must we have been exchanging?
must you have been exchanging?
must they have been exchanging? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I exchange?
mustn't you exchange?
mustn't he 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 he 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 he 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 he have been exchanging?
mustn't we have been exchanging?
mustn't you have been exchanging?
mustn't they have been exchanging?