Modify verbs, adjectives, or other adverbs. They frequently end in -ly and answer How? , When? , Where? , or To what extent? (e.g., She sang beautifully , The coffee was incredibly hot ).
The appendices at the end of the book are a hidden gem. They provide quick-reference tables for irregular verbs, spelling rules, and differences between British and American English, serving as a fantastic cheat-sheet for writers. a complete course of english grammar