can buy
Verbo irregular: buy - bought- bought

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can buy
you can buy
she can buy
we can buy
you can buy
they can buy 	I can be buying
you can be buying
she can be buying
we can be buying
you can be buying
they can be buying	I can have bought
you can have bought
she can have bought
we can have bought
you can have bought
they can have bought	I can have been buying
you can have been buying
she can have been buying
we can have been buying
you can have been buying
they can have been buying	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can't buy
you can't buy
she can't buy
we can't buy
you can't buy
they can't buy 	I can't be buying
you can't be buying
she can't be buying
we can't be buying
you can't be buying
they can't be buying	I can't have bought
you can't have bought
she can't have bought
we can't have bought
you can't have bought
they can't have bought	I can't have been buying
you can't have been buying
she can't have been buying
we can't have been buying
you can't have been buying
they can't have been buying	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I buy?
can you buy?
can she buy?
can we buy?
can you buy?
can they buy? 	can I be buying?
can you be buying?
can she be buying?
can we be buying?
can you be buying?
can they be buying? 	can I have bought?
can you have bought?
can she have bought?
can we have bought?
can you have bought?
can they have bought? 	can I have been buying?
can you have been buying?
can she have been buying?
can we have been buying?
can you have been buying?
can they have been buying? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can't I buy?
can't you buy?
can't she buy?
can't we buy?
can't you buy?
can't they buy? 	can't I be buying?
can't you be buying?
can't she be buying?
can't we be buying?
can't you be buying?
can't they be buying? 	can't I have bought?
can't you have bought?
can't she have bought?
can't we have bought?
can't you have bought?
can't they have bought? 	can't I have been buying?
can't you have been buying?
can't she have been buying?
can't we have been buying?
can't you have been buying?
can't they have been buying?