Business English: A Practice Book by Rose Buhlig

2. To indicate an abbreviation; as,

The firm of Clark Bros. has opened a new office at 144 Pleasant St., Erie, Pa. The _interrogation mark_ (?) is used-- To indicate the end of a sentence that asks a question; as, When did you order the goods? The _exclamation mark_ (!) is used-- To indicate the end of a sentence or other expression that shows strong feeling; as, Such demands are inhuman! Frequently, all that shows exactly how the writer wished his thought to be understood is the punctuation. The same words may express different ideas according to the mark of punctuation that follows them. Read the following to show the meaning that the writer wished to convey by each. Explain the circumstances under which each might have been spoken.