could exchange
Verbo regolare: exchange - exchanged- exchanged

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could exchange
you could exchange
she could exchange
we could exchange
you could exchange
they could exchange 	I could be exchanging
you could be exchanging
she could be exchanging
we could be exchanging
you could be exchanging
they could be exchanging	I could have exchanged
you could have exchanged
she could have exchanged
we could have exchanged
you could have exchanged
they could have exchanged	I could have been exchanging
you could have been exchanging
she could have been exchanging
we could have been exchanging
you could have been exchanging
they could have been exchanging	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could not exchange
you could not exchange
she could not exchange
we could not exchange
you could not exchange
they could not exchange 	I could not be exchanging
you could not be exchanging
she could not be exchanging
we could not be exchanging
you could not be exchanging
they could not be exchanging	I could not have exchanged
you could not have exchanged
she could not have exchanged
we could not have exchanged
you could not have exchanged
they could not have exchanged	I could not have been exchanging
you could not have been exchanging
she could not have been exchanging
we could not have been exchanging
you could not have been exchanging
they could not have been exchanging	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I exchange?
could you exchange?
could she exchange?
could we exchange?
could you exchange?
could they exchange? 	could I be exchanging?
could you be exchanging?
could she be exchanging?
could we be exchanging?
could you be exchanging?
could they be exchanging? 	could I have exchanged?
could you have exchanged?
could she have exchanged?
could we have exchanged?
could you have exchanged?
could they have exchanged? 	could I have been exchanging?
could you have been exchanging?
could she have been exchanging?
could we have been exchanging?
could you have been exchanging?
could they have been exchanging? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I not exchange?
could you not exchange?
could she not exchange?
could we not exchange?
could you not exchange?
could they not exchange? 	could I not be exchanging?
could you not be exchanging?
could she not be exchanging?
could we not be exchanging?
could you not be exchanging?
could they not be exchanging? 	could I not have exchanged?
could you not have exchanged?
could she not have exchanged?
could we not have exchanged?
could you not have exchanged?
could they not have exchanged? 	could I not have been exchanging?
could you not have been exchanging?
could she not have been exchanging?
could we not have been exchanging?
could you not have been exchanging?
could they not have been exchanging?