But since in this case, the user is just setting up the task, I need to confirm that I understand the requirements. Let me summarize:

First, I need to identify the words that are not proper nouns. Proper nouns are names of specific people, places, organizations, etc., like "Alice" or "New York." So I have to make sure those stay the same.

What if the word doesn't have three synonyms? Maybe use similar words or slightly different phrasing. Also, need to maintain the correct form, like verb tenses or plurals. For example, if the word is "running," maybe jogging? But maybe the context matters. If it's part of a sentence structure, like "She is running," the replacement should still fit grammatically.

Sample input: "The quick brown fox jumps over the lazy dog, but Alice stays calm."

Another thing: the user might be doing some kind of text modification for creativity, maybe for writing variations or something like that. So they want options to choose from. But the instruction is just to generate the three variants, not to select them.

So when the user provides the text, I'll need to process each word:

For every non-proper noun, I need to find three synonyms or alternatives. That might be tricky for some words. For example, if the word is "happy," possible variants could be joyful. But I have to check if the word is a proper noun first.