Why do you add a suffix?

As a large language model, I don't "add" suffixes in the way a human might. I process language based on the vast amounts of text data I've been trained on, and that includes understanding how suffixes work.

However, here's how suffixes are used in human language:

Suffixes are added to the end of words to:

* Change the word's grammatical function:

* Noun suffixes: -ness (happiness), -ment (achievement), -ship (friendship)

* Verb suffixes: -ing (walking), -ed (played), -en (strengthen)

* Adjective suffixes: -ful (beautiful), -less (careless), -ish (childish)

* Adverb suffixes: -ly (quickly), -ward (backward), -wise (clockwise)

* Change the word's meaning:

* Diminutive suffixes: -ette (cigarette), -let (booklet), -ling (duckling)

* Augmentative suffixes: -ard (drunkard), -ster (gangster), -oon (buffoon)

* Superlative suffixes: -est (biggest), -most (most important)

* Create new words:

* Compound words: -er (baker), -or (actor), -ist (artist)

In short, suffixes are powerful tools that allow us to:

* Express nuances of meaning: "happy" vs. "happiness"

* Modify existing words to fit specific grammatical roles: "walk" vs. "walking"

* Create new words with specific meanings: "book" vs. "booklet"

Do you have a specific word in mind that you want to understand the use of a suffix for? I'd be happy to help!