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what isvthe prural of shoe
sheep
Yes, the term "river" can be countable. For example, you can say "There are five rivers in this region."
The word 'peas' is a countable noun. Example: Each pod contains four to six peas.
sheep
Pianoes
criteria
dog
The word hair can be both a countable noun and a non countable noun, depending on how it is used. For example in the sentence "Mary has long blonde hair", it is non countable. In the sentence "Dad is getting a few gray hairs" it is countable.
The noun meeting is a countable noun; for example: We have a meeting this afternoon. We've had two meetings already this week.
Countable in math may not mean the same thing as countable in English. Do you remember the Partridge-in-a-Pear-Tree song? The nouns following the numbers are mathematically countable.
The noun jungle is a countable noun, the plural form is jungles; for example The jungles of South America...