must exchange
Verbo regular: exchange - exchanged- exchanged

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not exchange
you must not exchange
she must not exchange
we must not exchange
you must not exchange
they must not exchange 	I must not be exchanging
you must not be exchanging
she must not be exchanging
we must not be exchanging
you must not be exchanging
they must not be exchanging	I must not have exchanged
you must not have exchanged
she must not have exchanged
we must not have exchanged
you must not have exchanged
they must not have exchanged	I must not have been exchanging
you must not have been exchanging
she must not have been exchanging
we must not have been exchanging
you must not have been exchanging
they must not have been exchanging	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not exchange?
must you not exchange?
must she not exchange?
must we not exchange?
must you not exchange?
must they not exchange? 	must I not be exchanging?
must you not be exchanging?
must she not be exchanging?
must we not be exchanging?
must you not be exchanging?
must they not be exchanging? 	must I not have exchanged?
must you not have exchanged?
must she not have exchanged?
must we not have exchanged?
must you not have exchanged?
must they not have exchanged? 	must I not have been exchanging?
must you not have been exchanging?
must she not have been exchanging?
must we not have been exchanging?
must you not have been exchanging?
must they not have been exchanging?