Here's why:
* Suffix: A suffix is a letter or group of letters added to the end of a word to change its meaning or grammatical function.
* Verb endings: Verb endings often indicate tense (present, past, future), person (first, second, third), or number (singular, plural).
For example:
* Walk (present tense, infinitive)
* Walking (present participle)
* Walked (past tense)
* Walks (third-person singular present tense)
* Will walk (future tense)
The endings "-ing", "-ed", "-s", and "will" are all suffixes that change the meaning and function of the verb "walk".