Sure, here are 14 sentences using superlatives:
1、Mount Everest is the tallest mountain in the world.
2、The Nile River is the longest river on Earth.
3、Antarctica is the coldest continent.
4、The Sahara Desert is the hottest desert.
5、The Pacific Ocean is the largest ocean.
6、The blue whale is the largest animal on the planet.
7、The cheetah is the fastest land animal.
8、The ostrich is the largest bird.
9、The Great Barrier Reef is the largest coral reef.
10、The Amazon Rainforest is the most biodiverse ecosystem.
11、The Grand Canyon is the deepest canyon in the world.
12、Angel Falls is the highest waterfall.
13、The Sahara Desert is the driest place on Earth.
14、The Mariana Trench is the deepest part of the ocean.
