These come in handy when talking about non-count items. For example,
A box of cereal
Two pounds of ground beef
Three gallons of ice cream
Five packs of gum
See also :
Speaking : Count and Non-count Nouns in Context[/audio]
, Using Measure Words[/audio]The Noncount Noun (from Grammar Bytes)[/audio]
For Pictures, see : The Oxford Picture Dictionary[/audio], pages 56-57.
For Vocabulary Games, see : Learning Vocabulary Can Be Fun[/audio].