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