give me 4 sentences on what is the difference between a prefix and a suffix?
A prefix is a word element that is added before a base word to modify its meaning. It changes the definition or creates a new word altogether. For example, "un-" in the word "unhappy" negates the meaning of "happy".
On the other hand, a suffix is a word element that is added after a base word to modify its meaning or change its grammatical function. It may indicate tense, plurality, or turn a noun into an adjective, among other things. For instance, "-ed" in "walked" transforms the base word "walk" into past tense.
While a prefix alters the meaning of a word, a suffix changes the form or function of a word. Both a prefix and a suffix can be added to a word, but they are added in different positions within the word structure.