Some of the most commonly-used affixes are "in," "dis," "re," "ed" and "ing." An affix is usually either a prefix or a suffix, depending on whether it’s appended to the beginning of a root word or its end. Many affixes have Latin or Greek origins and are added to base or root words to modify them or add to their existing meaning.
Some affixes such as "mis," "dis" and "anti" change the meaning of root words entirely. Others modify certain properties such as degree, number or manner. Some examples of this type are "extra," "hyper," "est," "er" and "s." Prefixes and suffixes modify root words to form new words, but they cannot function as stand-alone words. Some prefixes such as "ex," "co" and "post" are hyphenated when added to the base word.
A special type of affix is the combining form, which can be either a prefix or a suffix. It adds a layer of extra meaning to base words, making it functionally different from prefixes and suffixes. However, like other affixes, it also cannot function as a stand-alone word. Some examples of combining form are "carbo," "bio," "geo," "chemo" and "hydro."
An infix is a special type of affix. It is placed within a word. Unlike prefixes and suffixes, it is not commonly used.