I would say so, but English is not mother tongue. :)

You can report to add it, I think.

(Native speaker) Yes it can be, and Duo accepted it on 4 April '14

'Ed' is used before words starting with 'e' I believe.

It means seven men and one of them is you. For example there are 7 men in a room and one of them asks you how many men are in this room? You'd answer "seven men, one is you" meaning you are included in the count.