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Rule 17: Singular Verb is used with expressions having structure of Singular Collective Noun of+ Plural Noun' e.g., A group of, A band of, A team of, A herd of, A flock of, A chain of, A class of, A set of, A bouquet of, A galaxy of, A fleet of, A pair of, A gang of, etc. A garland of flowers is ready. A batch of students is studying here. In these cases the verb is used in accordance with Subject (A group of, A team of etc.) which is singular in nature.
Rule 18: Singular verb is used with Hyphenated Expressions/ Singular Noun Repeated after a Preposition. (Plural Noun cannot be used) e.g., Wave after wave, Ship after ship, Mistake after mistake, Attempt after Attempt, Question after question Brick upon brick, Storey upon story, Box into box, etc. Question after question was asked to me. Storey upon story is being built. Attempt after attempt was made
Rule 19: Sentence beginning with 'There'. Is Are is used according to the subject following is/are. e.g., There is a book on the table. There are some books on the table