English verb conjugation
COULD TIER TIER TIER TIER

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

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

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I couldn't tier tier tier tier you couldn't tier tier tier tier he couldn't tier tier tier tier we couldn't tier tier tier tier you couldn't tier tier tier tier they couldn't tier tier tier tier	I couldn't be tier tier tier tiering you couldn't be tier tier tier tiering he couldn't be tier tier tier tiering we couldn't be tier tier tier tiering you couldn't be tier tier tier tiering they couldn't be tier tier tier tiering
Perfect	V-ing perfect
I couldn't have tier tier tier tiered you couldn't have tier tier tier tiered he couldn't have tier tier tier tiered we couldn't have tier tier tier tiered you couldn't have tier tier tier tiered they couldn't have tier tier tier tiered	I couldn't have been tier tier tier tiering you couldn't have been tier tier tier tiering he couldn't have been tier tier tier tiering we couldn't have been tier tier tier tiering you couldn't have been tier tier tier tiering they couldn't have been tier tier tier tiering

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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
couldn't I tier tier tier tier? couldn't you tier tier tier tier? couldn't he tier tier tier tier? couldn't we tier tier tier tier? couldn't you tier tier tier tier? couldn't they tier tier tier tier?	couldn't I be tier tier tier tiering? couldn't you be tier tier tier tiering? couldn't he be tier tier tier tiering? couldn't we be tier tier tier tiering? couldn't you be tier tier tier tiering? couldn't they be tier tier tier tiering?
Perfect	V-ing perfect
couldn't I have tier tier tier tiered? couldn't you have tier tier tier tiered? couldn't he have tier tier tier tiered? couldn't we have tier tier tier tiered? couldn't you have tier tier tier tiered? couldn't they have tier tier tier tiered?	couldn't I have been tier tier tier tiering? couldn't you have been tier tier tier tiering? couldn't he have been tier tier tier tiering? couldn't we have been tier tier tier tiering? couldn't you have been tier tier tier tiering? couldn't they have been tier tier tier tiering?