(all of the enhanced units present parts of speeches (when applicable), have definitions for word entries, and clarifying sentences in context)

(when visiting old graveyards and examining the epitaphs on gravestones, there are certain words and phrases which could be difficult or impossible to understand without knowing what the words in this unit mean)

(in 1946, an eighteen-year-old San Diego High School student wrote an essay in which he asked for plain courtesy when driving)