Упражнение 6. Переведите следующие предложения. Определите, какую функцию выполняет слово since. 1. Since penicillin was discovered a vast amount of information has been accumulated concerning its use. 2. Senna is a favourite cathartic, since it can be made up into a sweet mass. 3. Since the liver of polikilothermic animals is less demanding than that of mammals, the liver of the frog is generally used for different kinds of investigations. 4. I have studied English since 2001.