Степени сравнения прилагательных в английском языке

Compare:
Mr. Jones is not happy
But Mr. Smith is happier
Billy is the happiest
of them
КОРОТКИЕ ПРИЛАГАТЕЛЬНЫЕ
Note: Y→I

This car is fast
The police car is faster
This red car is the fastest
Which of the cars is the fastest?

Who is the thinnest?
Mr. Brown isn’t
thin
Mrs. Smith is a bit
thinner
Mrs. Phillips is
the thinnest
Note: n → nn

Which fruit is the sweetest?
These apples are sweet
These oranges are
sweeter
These bananas are
the sweetest

Which breakfast is the most substantial?
This breakfast is
substantial
This breakfast is
more substantial
But this breakfast is
the most substantial
ДЛИННЫЕ ПРИЛАГАТЕЛЬНЫЕ

Which of this products is the most healthy?
Bread is healthy
Meat is more healthy
Vegetable is the most
healthy product

Irregular forms (исключения)