Which option does NOT describe inflectional morphemes?

Inflectional morphemes are grammatical units that can be added to words to modify their meaning and grammatical properties without changing the core meaning of the word. They serve specific grammatical functions and generally convey information such as tense (e.g., adding -ed to a verb to indicate past tense) or plurality (e.g., adding -s to a noun to indicate more than one).

The key characteristic of inflectional morphemes is that they adjust the properties of a word while preserving its grammatical function. For instance, adding -ing to a verb changes its tense from present to progressive but still keeps it a verb. Therefore, indicating that inflectional morphemes change the function of a word does not align with their purpose, as they do not transform the word into a different part of speech. They modify the word in a way that maintains its function within a sentence.

In contrast, other options correctly describe inflectional morphemes. They indeed can add meaning, such as indicating tense or plurality, and they maintain the original function of the word, thereby not altering its grammatical category. This essential understanding of inflectional morphemes helps clarify why the assertion regarding how they change the function of a word is not accurate.