Words often take different forms such as nouns, verbs and adjectives.
Let’s take a look at the given sentences:
Example 1: “Respect your parents and teachers.” (respect – verb)
Example 2: “Be respectful to your parents and teachers.” (respectful – adjective)
Example 3: “Show respect to your parents and teachers.” (respect – noun)
We have used different forms of the word ‘respect’. You can see that with the addition of the suffix -ful, the noun (respect) changes to an adjective. Depending on the role the word plays in the sentence, we can classify it into the different parts of speech.