Вчём разница между can you tell could you tell me

can you tell me - подскажите

could you tell me- не могли бы вы подсказать мне.. (более вежливая форма)

russian, also called great russian, is a member of the indo-european family of languages. as russian is a(1) widespread _ language, it is considered to be one of the (2) major _ world languages. knowledge of the russian language opens the door to the study of russian's rich tradition of literature, art and music. russian literature (3) ranks_ among the most beautiful and exciting national literatures in the world. russian is the (4) native _ language of the greatest people known (5) throughout _ the world:

l. tolstoy, p. tchaikovsky, i. pavlov, a. sakharov, to name just a few. russian (6) is recognized_ as a very difficult language. if you speak italian, french, or german, you will learn russian vocabulary even more easily as many words (7) were borrowed_ in the 18th and 19th countries from these languages. if you neither travel regularly to russia nor have a russian pen friend, you should (8) practice _ your russian on other ways. there is a wealth of books and dvds waiting for you, and many are (9) available _ at local russian shops. if you study russian one hour a day regularly, you will probably be (10) fluent _ in three years. being able to read a newspaper article with a dictionary can be (11) achieved _ in a year.