Plurals without "s"

[frank]

Most nouns require an "s" to pluralize. There are some exceptions, though.

sheep, trout, stuff, equipment

fish can be fish (same kind) or fishes (different)

Could you help me expand the list? Thanks in advance.

[Torsten]

Hi Frank,

This is an interesting topic which provides room for controversy. For example the word equipment might be considered as a mass noun which means it doesn't have a plural form. (other than such nouns like sheep, fish, stuff, etc.) However, if you google the word 'equipments' you will find more than 1 million results. Also, words like food or accommodation used to be considered uncountable mass nouns but now many people think it is acceptable to such plural form like accommodations or foods.

In addition you might want to take a look at the posts below - they all contain some information about uncountable nouns:
http://www.english-test.net/forum/ftopic2234.html
http://www.english-test.net/forum/ftopic1250.html#3949
http://www.english-test.net/forum/ftopic1360.html
http://www.english-test.net/forum/ftopic1250.html
http://www.english-test.net/forum/ftopic2524.html
http://www.english-test.net/forum/ftopic502.html
http://www.english-test.net/forum/ftopic2729.html
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