Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could expire expire you could expire expire she could expire expire we could expire expire you could expire expire they could expire expire
V-ing form
I could be expire expiring you could be expire expiring she could be expire expiring we could be expire expiring you could be expire expiring they could be expire expiring
Perfect
I could have expire expired you could have expire expired she could have expire expired we could have expire expired you could have expire expired they could have expire expired
V-ing perfect
I could have been expire expiring you could have been expire expiring she could have been expire expiring we could have been expire expiring you could have been expire expiring they could have been expire expiring
Negation
Simple form
I could not expire expire you could not expire expire she could not expire expire we could not expire expire you could not expire expire they could not expire expire
V-ing form
I could not be expire expiring you could not be expire expiring she could not be expire expiring we could not be expire expiring you could not be expire expiring they could not be expire expiring
Perfect
I could not have expire expired you could not have expire expired she could not have expire expired we could not have expire expired you could not have expire expired they could not have expire expired
V-ing perfect
I could not have been expire expiring you could not have been expire expiring she could not have been expire expiring we could not have been expire expiring you could not have been expire expiring they could not have been expire expiring
Interrogative form
Simple form
could I expire expire? could you expire expire? could she expire expire? could we expire expire? could you expire expire? could they expire expire?
V-ing form
could I be expire expiring? could you be expire expiring? could she be expire expiring? could we be expire expiring? could you be expire expiring? could they be expire expiring?
Perfect
could I have expire expired? could you have expire expired? could she have expire expired? could we have expire expired? could you have expire expired? could they have expire expired?
V-ing perfect
could I have been expire expiring? could you have been expire expiring? could she have been expire expiring? could we have been expire expiring? could you have been expire expiring? could they have been expire expiring?
Interro-negative form
Simple form
could I not expire expire? could you not expire expire? could she not expire expire? could we not expire expire? could you not expire expire? could they not expire expire?
V-ing form
could I not be expire expiring? could you not be expire expiring? could she not be expire expiring? could we not be expire expiring? could you not be expire expiring? could they not be expire expiring?
Perfect
could I not have expire expired? could you not have expire expired? could she not have expire expired? could we not have expire expired? could you not have expire expired? could they not have expire expired?
V-ing perfect
could I not have been expire expiring? could you not have been expire expiring? could she not have been expire expiring? could we not have been expire expiring? could you not have been expire expiring? could they not have been expire expiring?