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The eagle is a bird of prey.In the first example, the telephone refers to telephones considered as a class.Likewise, in the other examples, the horse refers to horses considered as a class, andthe eagle refers to eagles considered as a class.It should be noted that the is not used when the word man represents the human raceconsidered as a class.e.g. Man has invented many things.The dolphin may be as intelligent as man.EXERCISES for Chapter 141. Rewrite each of the following sentences, changing the subject of the verb to thesingular, inserting a or an before the subject, as appropriate, and changing the verb toagree with the subject. For example:Violins are difficult to play.A violin is difficult to play.Unions have been formed.A union has been formed .Answers are always provided.An answer is always provided.Heirs have many friends.An heir has many friends.1. Avocados are expensive.2. Windows are an important feature of an artist"s studio.3. Umbrellas should not be used during a thunderstorm .4. Horses can be useful in the mountains.5. Cashews are a type of nut.6. Onions can be used for flavoring soup.7. Trucks have many uses.8. Hours passed.9. Sentences should have proper punctuation.10. Escalators are very convenient.11. Uniforms must be worn.12. Boxes were found on the floor.13. Marshes lie beyond the city boundary.14. Ideas can be valuable.15. Eggs are a good source of protein.Answers2. Fill in each blank with either the indefinite article (a or an) or the definite article(the). Use a or an with nouns referring to people or things which have not beenmentioned previously, and use the with nouns referring to people or things which havebeen mentioned previously.