To form new words by adding a prefix or suffix, you can enhance or alter the meaning of the original words. Let's go through each word step-by-step:
Social : Add the prefix "anti-" to form "antisocial," meaning against or not sociable.
National : Add the suffix "-ism" to form "nationalism," which refers to a strong identification with one's own nation and support for its interests.
Risible : Add the suffix "-ity" to form "risibility," which is the quality of being able to provoke laughter.
Read : Add the suffix "-able" to form "readable," meaning able to be read or easy to read.
Walk : Add the suffix "-er" to form "walker," which refers to someone who walks.
Computer : Add the suffix "-ize" to form "computerize," meaning to convert something to be operated or controlled by a computer.
Septic : Add the prefix "anti-" to form "antiseptic," meaning preventing infection by inhibiting the growth of microorganisms.
Beauty : Add the suffix "-ful" to form "beautiful," meaning full of beauty or pleasing to the senses.
Self : Add the suffix "-less" to form "selfless," which means putting the needs of others before one's own.
Use : Add the prefix "re-" to form "reuse," meaning to use again.
Each of these new words has a slightly altered meaning from its root word, demonstrating how prefixes and suffixes can modify language.