How do you know what we want to put in any word to make it adjective?

To transform a Word into an adjective, you typically add a suffix that conveys a descriptive quality. Common suffixes include "-ful," "-less," "-ic," and "-y." Additionally, some Words can be modified with prefixes or by changing their form entirely, such as "beauty" to "beautiful." Understanding the context and meaning of the base Word can guide you in selecting the appropriate suffix to create an adjective.