Теория:
To speak about things now and in the past, you need the appropriate vocabulary.
century – век
original – оригинальный
tough – тяжелый, трудный
without – без
electricity – электричество
telephone – телефон
washing machine – стиральная машина
coach – карета, экипаж
clean river – чистая река
pollution – загрязнение
pure – чистый
Examples:
Many years ago people didn't have washing machines.
The rivers were clean and the air was pure.
Источники:
http://www.crafthubs.com/