时态疑问!My brother has just come back from Beijing.I have read

Dear Charlie,I have just come back from my vacation.This sum I just come back from ( )1.Mr.Wang has just come back from Beijing,but soon he wil I have Just come back I have just received a letter from my brother, Ti I have just receiverd a letter from my brother. My uncle (just come)back from Japen I am just come back from you I am glad you have come back from Beijing.Please tell me how I have just received a letter from my brother.这句话中 just和 hav I have just received a letter from my brother.（同义句）=I have j 怎么回答 who has just come back from india?