"What is the difference between?" a. have been translated - The documents have been translated (plural documents and it's been done in the past) b. Has translated - Arwa has translated some text from Arabic to English (possessive - Arwa was the translator) - "The document has translated well"- meaning it was possible to make it clear in the 2nd language. c. Have translated -many people have translated the popular book over the last 20 years - or the books have translated well - plural for the people's work in the past - or plural for more than one thing to be translated. You need someone like Peachey or Jeff to explain it in mechanical terms - aside from Jura, who isn't here, they're the two strongest people I know of on this site.

a. have been translated = something has/have been translated "The books have been translated by several people." "The book has been translated by several people." b. Has translated = he/she has translated "He has translated the book." c. Have translated = I/you/we/you/they have translated "I have translated the book."

what is this, i do not understand too.....

1)passive form of present perfect: he have been translated this topic by hard working. 2)present perfect(third person) like it, she,he...he has translated that unit. 3)present perfect for: I ,you,we,they...they have translated that unit.