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It doesn't have anything to do with AHDI. Units of measurement take singular verbs.
"Whenever subjects are units of measurement and express periods of time, amounts of money, distances, weights, or any other technical measurement representing a total amount, the subjects take a singular verb. On the other hand, when these subjects indicate a collection of individual parts, the subjects take a plural verb."
http://www.canadianwritersguide-2e.nelson.com/includes/HED/buscomm/Word/Module%2022.Working%20with%20coll%20subs.doc
http://www.egr.uh.edu/Cive/faculty/chellam/files/GrammarReview_SubjectVerbAgreement.pdf
"7. Units of measurement take a singular verb when they refer to a collective entity and a plural one
when they refer to individuals."
20. When units of measurement for distance, time, volume, height, weight, money, etc. are used as
subjects, they usually take the singular verb form.
"Two teaspoons of sugar was all that the cake recipe called for."
http://www.yourdictionary.com/grammar-rules/20-Rules-of-subject-verb-agreement.html
see #11.
http://www.hf.ntnu.no/engelsk/staff/johannesson/111gram/lect15.htm "# Amount expressions treated as units of measurement require singular agreement (Fifty pounds is too much)." |
CJ, you are correct - units of measurement
