надо написать письмо другу про 3 дня в лондоне.
его достопримечательности и т.п.

Dear Zac,Thanks for your recent letter.Im sorry,I havent enough time to answer you.You know,that Im going to London next week.I cant wait this trip!The first,Im going to visit The City of London.People say that the City is the money of London,because there are manny offices,firms and banks.Then I want wisit the official London residence of the Queen-Buckingham Palace.Also I should visit The West End.There is the House of Parlament with the clock Big Ben there.Big Ben began to function in 1859 and since then it has been the biggest clock in Britan.I hope that we will meet in London.Give my love to your parents.