Теория:

To speak about things now and in the past, you need the appropriate vocabulary.
 
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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/