Сна времена simple past / present perfect / past perfect 1. when jack (enter) the room, i (recognize, not) him because he (lose) so much weight and (grow) a beard. he looked totally different! 2. the maya established a very advanced civilization in the jungles of the yucatan; however, their culture (disappear, virtually) by the time europeans first (arrive) in the new world. 3. i (visit) so many beautiful places since i (come) to utah. before moving here, i (hear, never) of bryce canyon, zion, arches, or canyonlands.

1. When Jack entered the room, I didn't him because he had lost so much weight and had grown a beard. He looked totally different! 
2. The Maya established a very advanced civilization in the jungles of the Yucatan; however, their culture had disappeared by the time Europeans first arrived in the New World. 
3. I have visited so many beautiful places since I came to Utah. Before moving here, I have never heard of Bryce Canyon, Zion, Arches, or Canyonlands.

I always use summer holidays for some easy work on the subjectsthat I need for my future studies. I improve my English, read literature and some historical materials. This work brings benefit and pleasure: reading books and listening to English songs, watching documentaries and training your memory while memorizing some verses, English phrases or dates. I am glad that my mother has taught me to do it easily and without any nervous tension. If you treat this work as a game or an amusement you can enjoy a part of the summer and facilitate for your future busy learning season.

My favourite book is "The adventures of Sherlock Holmes".  The book was  written by Arthur Conan Doyle,  the famous writer from Scotland in 1891. The book about the famous detective is popular all over the world.  Sherlock Holmes and his friend Doctor Watson investigate different crimes in London of the 19th century.  Sherlock Holmes uses his famous method of deduction to solve these crimes.  He looks for stolen jewels, finds missing people and points to the murderers.  The stories are exceptionally interesting and exciting.  Many of them were made into  films.