According to the above mentioned website, Police is an aggregate noun.

The police are still looking for the Olympic Park bomber.

If it is so, then why army is always considered as a collective noun. What is the main difference between the two?

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Comments  (Page 2) 
Obviously, depending on where we learned English, it has some bearing on our understanding toward some of the most common debated questions. To validate my own understanding, I did some searching and came to a conclusion, In the US, some experts agree that either singular or plural is acceptable, but must be consistently used in the context. However, the majority considers “Police” as plural. In contrast, it seems that in Europe “police” is used as a singular noun. I learned something today…..

House Style Guide

The singular form packs a greater punch, but both are correct. ... Form plural possessives by adding an apostrophe to plural nouns ending in "s" (appellees' ...
courts.state.ar.us/courts/rd_style6.html - 58k - Cached - Similar pages

Unit 5. Singular, plural, and collective nouns

Collective nouns can be used with singular or plural verbs. ... WARNING: "Police" is a plural noun, but does not end in "-s". The police were informed ...

The Grammar Doctor's Tip Archive Page 7

My dictionary doesn't indicate whether it considers it singular or plural, but I still treat it as singular. Note that "police" is always plural, as is ...
www.grammardoctor.com/archive10.htm - 39k - Cached - Similar pages

Online Style Guide - P - Online Specials - Times Online
Whether singular or plural, always maintain consistency within a story ... Police Complaints Authority was replaced (April 2004) by the Independent Police ...
www.timesonline.co.uk/article/0,,2941-576,00.html - Similar pages

File Format: PDF/Adobe Acrobat - View as HTML
singular and plural, under one number, while others prefer the. international numbering. ... In less than ten years, the South African Police Service has ...

Well, i've come across this website which enlists plural nouns and categorizes them with respect to their form (singular or plural)


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