... common, proper, abstract and collective. " Take care with the punctuation of proper nouns. Because they are the special individual names of people, towns, countries, newspapers, days of the ... care with the punctuation of this contraction. The apostrophe represents the omission of four letters: o’clock = of the clock Do not write: o’Clock, O’Clock or o,clock. of or off? These exemplar sentences ... help: He is the youngest OF four children. (pronounced ov) Jump OFF the bus. (rhymes with cough) Avoid the clumsy construction: Jump off of the bus. Jump off the bus. official or officious? OFFICIAL...