can exchange
Verbo regular: exchange - exchanged- exchanged

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

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

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

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