http://www.englishforums.com/search/pro.htm?q=tag%3aAdverbs+tag%3aCountable+or+uncountable&tag=Adverbs,Countable+or+uncountable&orTags=0Search results for 'tag:Adverbs tag:Countable or uncountable' matching tags 'Adverbs' and 'Countable or uncountable'en-USCSMOD (Build: 3161.22795)http://www.englishforums.com/English/AnOvertimeOrAOvertime/vhww/post.htm#21819Mon, 09 Feb 2004 07:46:04 GMT946f00bb-57d3-4b7b-a9a2-059b5341af52:21819whl626I worked 3 hours overtime. ( The ' overtime ' here is ' adverb ' ) to mean how you work. <br /> <br />water is uncountable noun, that's why we say 2 litres of water not 2 litres waters <br /> <br />but waters with s means the ocean on the shore of a country. <br /> <br />eg. A pirate ship has encroached the waters of Thailand. <br /> <br /> <br />To know if a noun is countable or uncountable, you have no choice but to rely on Dictionary.