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Plural forms that refuse to follow the rule

child - children

How to use this sheet

Most English nouns form the plural with a fixed ending, but a small group changes inside the word instead, and a few do not change at all. These are very old forms that survived because the words are so common - you meet them every day, so there is no way around memorising them. The table pairs each singular with its plural and shows the plural inside a real sentence.
First column: one of something. Second column: more than one. Third column: the plural form doing its job in a sentence.
SingularPluralExample
manmenTwo men are waiting outside.
womanwomenThe women in my office share a car.
childchildrenTheir children go to school by bike.
personpeopleTen people were in the queue.
footfeetMy feet hurt after the long walk.
toothteethBrush your teeth twice a day.
mousemiceWe found mice in the garage.
sheepsheepThe farmer has two hundred sheep.
fishfishI caught three fish this morning.

In use

Both of my children have brown eyes. How many people are coming tonight? He lost two teeth playing hockey.

Watch out

There are a lot of peoples in the street.

The plural form in row 4 already means several people - never add the regular plural ending to it. Rows 8 and 9 do not change at all: only the number word and the verb around them show whether you mean one or many.
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