The process of word formation in English involves...

A Prefixation in English, as in "unhappy" and "disagree," is exclusively used to create words with positive meanings. B Suffixation is a process that only changes the grammatical class of a word, without affecting its basic meaning, as in "joy" (noun) to "joyful" (adjective). C In English, suffixes do not have semantic functions and are used only to determine the pronunciation of complex words. D Words formed by compounding, such as "breakfast" and "sunflower," cannot be used in formal contexts due to the informal nature of these combinations. E Derivation involves adding affixes (prefixes or suffixes) to a base, while compounding creates new words by combining two independent bases, as in "notebook."