English verb conjugation
COULD MENTION

Regular verb: mention - mentioned - mentioned

Affirmation

Simple form	V-ing form
I could mention you could mention he could mention we could mention you could mention they could mention	I could be mentioning you could be mentioning he could be mentioning we could be mentioning you could be mentioning they could be mentioning
Perfect	V-ing perfect
I could have mentioned you could have mentioned he could have mentioned we could have mentioned you could have mentioned they could have mentioned	I could have been mentioning you could have been mentioning he could have been mentioning we could have been mentioning you could have been mentioning they could have been mentioning

Negation

Simple form	V-ing form
I could not mention you could not mention he could not mention we could not mention you could not mention they could not mention	I could not be mentioning you could not be mentioning he could not be mentioning we could not be mentioning you could not be mentioning they could not be mentioning
Perfect	V-ing perfect
I could not have mentioned you could not have mentioned he could not have mentioned we could not have mentioned you could not have mentioned they could not have mentioned	I could not have been mentioning you could not have been mentioning he could not have been mentioning we could not have been mentioning you could not have been mentioning they could not have been mentioning

Interrogative form

Simple form	V-ing form
could I mention? could you mention? could he mention? could we mention? could you mention? could they mention?	could I be mentioning? could you be mentioning? could he be mentioning? could we be mentioning? could you be mentioning? could they be mentioning?
Perfect	V-ing perfect
could I have mentioned? could you have mentioned? could he have mentioned? could we have mentioned? could you have mentioned? could they have mentioned?	could I have been mentioning? could you have been mentioning? could he have been mentioning? could we have been mentioning? could you have been mentioning? could they have been mentioning?

Interro-negative form

Simple form	V-ing form
could I not mention? could you not mention? could he not mention? could we not mention? could you not mention? could they not mention?	could I not be mentioning? could you not be mentioning? could he not be mentioning? could we not be mentioning? could you not be mentioning? could they not be mentioning?
Perfect	V-ing perfect
could I not have mentioned? could you not have mentioned? could he not have mentioned? could we not have mentioned? could you not have mentioned? could they not have mentioned?	could I not have been mentioning? could you not have been mentioning? could he not have been mentioning? could we not have been mentioning? could you not have been mentioning? could they not have been mentioning?