The good boy behaved well. which one is adverb?

Match the definition or example to the term.

Which statement would you identify as being correct? a. it is important to learn the etymology of every word in a text. b. it is important to understand the etymology of every word in a text. c. it is important to study the etymology of every word in a text. d. it is important to study the etymology of some words in a text.

How do the excerpt and diagram complement one another?