Here's why:
* "Please" is already a complete word: It functions as an adverb, expressing politeness.
* Suffixes are added to the end of words: They modify or change the meaning of the original word.
However, you can add other words or phrases to create a similar effect:
* "Please, kind sir/madam": This adds a formal touch.
* "Please, if you would be so kind": This expresses a stronger degree of politeness.
* "Please, may I..." This is a polite way to ask for something.
It's important to note that the most effective way to express politeness is through tone of voice and body language, in addition to using words like "please."