Within the grammar of British English the perfect present tense is employed when you want to articulate an action that has taken place a while back that is of consequence on the prevailing moment. Consider this example: I’ve misplaced my watch. Help me look for it, while in American English it would be, I lost my watch. Help me look for it. English grammar software is there to sort out such issues so that you as a user only need to purchase the grammar software and you are set. Disparities concerning the use of the present perfect in British English and simple past tense in American English are thus easily sorted out with the help of English grammar software and English writing software for organization. - See more at: http://www.writeenglish.org/writing/what-is-the-difference-between-american-english-and-british-english/#sthash.g93XmUM9.dpuf