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As I learn about Degree of Comparison or some people say Comparative Degree.

there are two kinds of them.

The First is

using More and The Most

for example

Beautiful --> more beautiful --> The Most Beautiful

The second is

using ..er and the ...est

example

pretty --> prettier --> the prettiest

The first is for long word and the second is for short word, but I find it different for the word FUN

it becomes more fun not funer or funner?

any body can explain it?

thank you