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Subject and Verb Agreement
http://www.grammarbook.com/grammar/subjectVerbAgree.asp Rule 9
With words that indicate portions—percent, fraction, part, majority, some, all, none, remainder, and so forth —look at the noun in your of phrase (object of the preposition) to determine whether to use a singular or plural verb. If the object of the preposition is singular, use a singular verb. If the object of the preposition is plural, use a plural verb.
Examples: Fifty percent of the pie has disappeared. Pie is the object of the preposition of.
Fifty percent of the pies have disappeared. Pies is the object of the preposition.
One-third of the city is unemployed. One-third of the people are unemployed.
NOTE: Hyphenate all spelled-out fractions.
All of the pie is gone. All of the pies are gone. Some of the pie is missing. Some of the pies are missing. None of the garbage was picked up. None of the sentences were punctuated correctly. Of all her books, none have sold as well as the first one.
NOTE: Apparently, the SAT testing service considers none as a singular word only. However, according to Merriam Webster's Dictionary of English Usage, "Clearly none has been both singular and plural since Old English and still is. The notion that it is singular only is a myth of unknown origin that appears to have arisen in the 19th century. If in context it seems like a singular to you, use a singular verb; if it seems like a plural, use a plural verb. Both are acceptable beyond serious criticism" (p. 664).
http://grammar.ccc.commnet.edu/grammar/sv_agr.htm
Fractional expressions such as half of, a part of, a percentage of, a majority of are sometimes singular and sometimes plural, depending on the meaning. (The same is true, of course, when all, any, more, most and some act as subjects.) Sums and products of mathematical processes are expressed as singular and require singular verbs. The expression "more than one" (oddly enough) takes a singular verb: "More than one student has tried this."
Some of the voters are still angry. A large percentage of the older population is voting against her. Two-fifths of the troops were lost in the battle. Two-fifths of the vineyard was destroyed by fire. Forty percent of the students are in favor of changing the policy. Forty percent of the student body is in favor of changing the policy. Two and two is four. Four times four divided by two is eight.
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19 ก.พ. 55 21:11:20
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