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a pair of pliersa pair of scissorsWhen the expression pair of is used as the subject of the verb, the verb must agreewith the word pair.e.g. Jeans are fashionable.A pair of jeans is expensive.Pliers are very useful.A pair of pliers jj often useful.In the above examples, the nouns jeans and pliers take the plural verb are, and thenoun pair takes the singular verb is.EXERCISES for Chapter 151. Rewrite the following general statements using singular nouns. Make sure that theverbs agree with their subjects. For example:Engineers must be familiar with computers.An engineer must be familiar with computers.Trees produce oxygen.A tree produces oxygen.1. Automobiles should be kept in good repair.2. Bats locate insects by means of sonar.3. Diplomats should, if possible, be multilingual.4. Hats are useful in cold weather.5. Physicists must study a great deal.6. Elephants can be dangerous.Answers2. Rewrite the following general statements using plural nouns. Make sure that theverbs agree with their subjects. For example:A bicycle is a convenient means of transportation.Bicycles are a convenient means of transportation.A secretary should be proficient in spelling and grammar.Secretaries should be proficient in spelling and grammar.1. A sportsman needs to remai n calm under pressure.2. An eagle has good eyesight.3. A conference requires careful planning.4. A rock is composed of minerals.5. A potato is rich in starch.6. An omelette is made of eggs and other ingredients.Answers3. Rewrite the following general statements using singular nouns. Make sure that theverbs agree with their subjects. For example:

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