5. Which word part can be added to a base word to change the number or tense?
Answer: A
Inflectional ending
An inflectional ending can be added to a base word to change its number or tense, allowing for grammatical adjustments in the structure of the word. This process is essential in English language arts to convey different meanings and functions of words.
A) Inflectional ending
Inflectional endings are specific suffixes that modify a word to indicate tense, number, or case. For example, adding "-s" to "cat" changes it to "cats," indicating a plural form, while "-ed" can transform "walk" into "walked," indicating past tense. This clearly aligns with the question's requirement for altering number or tense.
B) Derivational ending
Derivational endings are prefixes or suffixes added to a base word that change the word's meaning or its part of speech, rather than simply altering its tense or number. For example, adding "un-" to "happy" creates "unhappy," changing the meaning but not the tense or number. Thus, this option does not meet the criteria outlined in the question.
C) Negative prefix
Negative prefixes, such as "un-" or "dis-," are used to negate the meaning of a word but do not affect its tense or number. For instance, "happy" becomes "unhappy" with the prefix "un-," which changes the meaning but leaves the tense and number intact. Therefore, this option is not relevant to the question.
D) Root word
A root word is the foundational part of a word to which prefixes and suffixes can be added, but on its own, it does not change tense or number. For example, "play" is a root word that can take inflectional endings to create "plays" or "played," but the root itself does not inherently change tense or number. Thus, this option fails to address the question's focus.
Conclusion
Inflectional endings are the correct answer as they specifically modify base words to express changes in tense or number, which is the core concept being tested. Other options, such as derivational endings, negative prefixes, and root words, do not serve this grammatical function, making them unsuitable in the context of the question.