That was to demonstrate an ongoing action, as opposed to a complete one (hence the simple tenses are marked where the box ends, with the continuous in the middle of it).

What is the black smudged bit supposed to be?

Thank you. Yes you are right, it’s just that “gone” would be more appropriate in terms of being consistent with the actual verb used for the rest of the diagram.

well, I think “been” means “gone and be back” while “gone” means “gone and still be there”. So aren’t they both correct out of a clear context?
However, thank you for this useful chart

…it has been WRITTEN…

Showing on going process (continuous)

why dont you fix the mistake ?:)) I searched this chart in the google after that I had worked other source..I had thought that. It must be wrong .

I came here for this mistake :))) thank you mr fafa

I would like to know if there is any difference between American English and British English when it comes to all 12 basic tenses in the English language. Would you be able to share more? Or is it a case where generally speaking, there isn’t much noticeable difference between American English and British English when it comes to the use of the 12 English tenses?

Regards,
Shizuka