Please help me to create a comprehensive set of spelling exercises specifically designed for [grade level] students to practice using prefixes and suffixes, including detailed explanations and examples for common prefixes like “un-,” “re-,” and “pre-,” as well as suffixes like “-ly,” “-ful,” and “-ness.” Encourage students to write their own sentences using words with these prefixes and suffixes, and provide additional activities that reinforce their understanding and application in different contexts.