Вот правильные формы сравнительной и превосходной степени для предложений:
Cars are getting cheaper as the years go by.
In my opinion, the tiger is the most dangerous animal of all.
Chemistry is the most difficult of all subjects.
Russia is the biggest country in the world.
Watching movies is more interesting than reading a book.
People in the village are friendlier than those in the city.
Harry is taller than Nick.
Bella is the most beautiful girl in our class.
Larry is five years older than Martin.
Mercury is the smallest planet in our solar system.
My mom is the best mother in the world.
Jerry is the youngest in our family.
Home-made food is better than food from a restaurant.
This is the worst day of my life.
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