can tier
Verbo regular: tier - tiered- tiered

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

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

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

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