Having chosen a limited subject, think it over and write the substance of what you wish to say in a single sentence. If you keep this sentence summary constantly in mind, your work will probably be a unit. If, for example, you are explaining baseball, your sentence summary might be: "Baseball is a field game, played with bat and ball, by eighteen men, nine on a side." In explaining a steam engine, you might say that "a steam engine may be defined as an apparatus for doing work by means of heat applied to water." Does that seem to you a good sentence summary ?

Exercises

573. Explain in a single sentence the main difference between an adjective and an adverb, or between arithmetic and algebra.

574. Sum up in a written sentence the main features, as you understand them, of one of the following games: football, tennis, golf, cricket, checkers, chess.

575. Reword the following common sayings:

1. The smallest worm will turn, being trodden on. 2. Murder will out. 3. A close mouth catches no flies. 4. Hitch your wagon to a star. 5. Nothing succeeds like success. 6. Little strokes fell great oaks. 7. I am always in haste, but never in a hurry.