Переведите предложения на российский язык, обращая внимание на обыкновенные и перфектные

Переведите предложения на российский язык, обращая внимание на простые и перфектные формы инфинитива. 1. The USA is known to be a federation of 50 states. 2. The USA is known to have been founded on July 4rh, 1776. 3. We know the first of April to be the day of jokes. 4. We know the expedition to have reached the river. 5. The article to be discussed tomorrow is written by our professor. 6. He brought the article to be translated into Russian. 7. The students come to the Institute earlier to get books from the library. * 8. The scientist was glad to obtain good results of his experiments. 9. The scientist was glad to have obtained good results of his experiments.