3 ].what tense should you use: Past Simple or Present Perfect ? Example: yesterday--Past Simple . already-- .................... , when-- ...................., yet- ................., last year-- .............., just- ..................... , 2 days ago-- ................. Divide these writers into 3 groups: Russian,British and American.[M.Twain L,Tolstoy A.Milne A. Pushkin R.Kipling. J. London P. Travers]