比较级：
I'm taller than you.
He's shouter than her.
I can run faster than you.
The one is much better than that one.
The one is cheaper than that one.
Dress is longer than shirt.
I made less mistake than you.
Your books are better than mine.
Your dress looks older than mine
Computers are much popular in the 21 century than before.
The little girl is more beautiful than her sister
For today is much hotter than yesterday ,I decide to swim.
最高级：
I'm the tallest people in my class.
He's theshoutest boy in that group.
You can run fastest in the class.
The one is the best one in the shop.
The one is the wist one I have ever bought.
The dress is the longest one.
I made the least mistake.
Your books are the best.
Your dress is the most pretty one.
就这样写,换几个人称就行了,应该可以到20个,加油!