could tier
Verbo regular: tier - tiered- tiered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could tier
you could tier
he could tier
we could tier
you could tier
they could tier 	I could be tiering
you could be tiering
he could be tiering
we could be tiering
you could be tiering
they could be tiering	I could have tiered
you could have tiered
he could have tiered
we could have tiered
you could have tiered
they could have tiered	I could have been tiering
you could have been tiering
he could have been tiering
we could have been tiering
you could have been tiering
they could have been tiering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not tier
you could not tier
he could not tier
we could not tier
you could not tier
they could not tier 	I could not be tiering
you could not be tiering
he could not be tiering
we could not be tiering
you could not be tiering
they could not be tiering	I could not have tiered
you could not have tiered
he could not have tiered
we could not have tiered
you could not have tiered
they could not have tiered	I could not have been tiering
you could not have been tiering
he could not have been tiering
we could not have been tiering
you could not have been tiering
they could not have been tiering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I tier?
could you tier?
could he tier?
could we tier?
could you tier?
could they tier? 	could I be tiering?
could you be tiering?
could he be tiering?
could we be tiering?
could you be tiering?
could they be tiering? 	could I have tiered?
could you have tiered?
could he have tiered?
could we have tiered?
could you have tiered?
could they have tiered? 	could I have been tiering?
could you have been tiering?
could he have been tiering?
could we have been tiering?
could you have been tiering?
could they have been tiering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not tier?
could you not tier?
could he not tier?
could we not tier?
could you not tier?
could they not tier? 	could I not be tiering?
could you not be tiering?
could he not be tiering?
could we not be tiering?
could you not be tiering?
could they not be tiering? 	could I not have tiered?
could you not have tiered?
could he not have tiered?
could we not have tiered?
could you not have tiered?
could they not have tiered? 	could I not have been tiering?
could you not have been tiering?
could he not have been tiering?
could we not have been tiering?
could you not have been tiering?
could they not have been tiering?