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Plural Word Forms

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Foreign Word Plurals - definition

There are many words in the English language that have been derived from foreign languages like Latin or Greek.
These words have two possible spellings for their plural forms: the English spelling and the foreign plural spelling.
For example: 
Word: formula, Latin plural: formulae, English plural: formulas

Some words have only the Latin plural spelling.
For example: 
larva - larvae; alga - algae
For words which have a Greek origin, we change them to their plural forms by replacing the -is at the end with -es. 
For example: 
analysis - analyses
crisis - crises

What are Irregular Plurals? - definition

Most English nouns form their plural by adding either -s (books, bands, bells) or -es (boxes, bunches, batches). These plural forms are said to follow a regular pattern. These noun forms are called regular plurals.

But not all nouns forms follow this regular pattern. In fact, some of the most common English nouns have irregular plural forms such as woman/women and child/children.

These noun forms that follow this irregular pattern in order to form their plurals are called irregular plurals. 

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