could tier tier tier tier
Regular verb: tier tier tier tier - tier tier tier tiered- tier tier tier tiered

, this verb may not exist. Conjugation is given as example.

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could tier tier tier tier
you could tier tier tier tier
he could tier tier tier tier
we could tier tier tier tier
you could tier tier tier tier
they could tier tier tier tier 	I could be tier tier tier tiering
you could be tier tier tier tiering
he could be tier tier tier tiering
we could be tier tier tier tiering
you could be tier tier tier tiering
they could be tier tier tier tiering	I could have tier tier tier tiered
you could have tier tier tier tiered
he could have tier tier tier tiered
we could have tier tier tier tiered
you could have tier tier tier tiered
they could have tier tier tier tiered	I could have been tier tier tier tiering
you could have been tier tier tier tiering
he could have been tier tier tier tiering
we could have been tier tier tier tiering
you could have been tier tier tier tiering
they could have been tier tier tier tiering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not tier tier tier tier
you could not tier tier tier tier
he could not tier tier tier tier
we could not tier tier tier tier
you could not tier tier tier tier
they could not tier tier tier tier 	I could not be tier tier tier tiering
you could not be tier tier tier tiering
he could not be tier tier tier tiering
we could not be tier tier tier tiering
you could not be tier tier tier tiering
they could not be tier tier tier tiering	I could not have tier tier tier tiered
you could not have tier tier tier tiered
he could not have tier tier tier tiered
we could not have tier tier tier tiered
you could not have tier tier tier tiered
they could not have tier tier tier tiered	I could not have been tier tier tier tiering
you could not have been tier tier tier tiering
he could not have been tier tier tier tiering
we could not have been tier tier tier tiering
you could not have been tier tier tier tiering
they could not have been tier tier tier tiering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I tier tier tier tier?
could you tier tier tier tier?
could he tier tier tier tier?
could we tier tier tier tier?
could you tier tier tier tier?
could they tier tier tier tier? 	could I be tier tier tier tiering?
could you be tier tier tier tiering?
could he be tier tier tier tiering?
could we be tier tier tier tiering?
could you be tier tier tier tiering?
could they be tier tier tier tiering? 	could I have tier tier tier tiered?
could you have tier tier tier tiered?
could he have tier tier tier tiered?
could we have tier tier tier tiered?
could you have tier tier tier tiered?
could they have tier tier tier tiered? 	could I have been tier tier tier tiering?
could you have been tier tier tier tiering?
could he have been tier tier tier tiering?
could we have been tier tier tier tiering?
could you have been tier tier tier tiering?
could they have been tier tier tier tiering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not tier tier tier tier?
could you not tier tier tier tier?
could he not tier tier tier tier?
could we not tier tier tier tier?
could you not tier tier tier tier?
could they not tier tier tier tier? 	could I not be tier tier tier tiering?
could you not be tier tier tier tiering?
could he not be tier tier tier tiering?
could we not be tier tier tier tiering?
could you not be tier tier tier tiering?
could they not be tier tier tier tiering? 	could I not have tier tier tier tiered?
could you not have tier tier tier tiered?
could he not have tier tier tier tiered?
could we not have tier tier tier tiered?
could you not have tier tier tier tiered?
could they not have tier tier tier tiered? 	could I not have been tier tier tier tiering?
could you not have been tier tier tier tiering?
could he not have been tier tier tier tiering?
could we not have been tier tier tier tiering?
could you not have been tier tier tier tiering?
could they not have been tier tier tier tiering?