1.5 Singular and Plural Forms
In the English language，most words are made plural simply by adding-s to the end of the word.However，there are some exceptions to this rule when a noun ends in-s，-sh，-ch，or-o.These words are changed to plurals by adding an-es.However，many medical words have special plural forms based on the ending of the word.Below are some general rules for the formation of plurals of medical terms along with examples to the plural forms of medical terms.
Rule 1：When the singular form of the word ends with-a，keep the-a and add an-e.
Rule 2：When the singular form of the word ends with-um，drop the-um and add an-a.
Rule 3：When the singular form of the word ends with-us，drop the-us and add an-i.
Rule 4：When the singular form of the word ends with-is，drop the-is and add an-es.
Rule 5：When the singular form of the word ends with-ma，keep the-ma and add a-ta.
Rule 6：When the singular form of the word ends with-ax or-ix，drop the-x and add a-ces.
Rule 7：When the singular form of the word ends with-nx or-yx，drop the-x and add a-ges.
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Rule 8：When the singular form of the word ends with-ex，drop the-ex and add an-ices.
Rule 9：When the singular form of the word ends with-on，drop the-on and add an-a.
Task 1 Identify and define the prefix in each of the following words.
Task 2 Write a word that means the opposite of each of the following words.
Task 3 Match the suffixes on the left with the correct definitions on the right.
Task 4 Identify the stressed syllable for each of the following medical terms.
Task 5 Change each word ending to the plural form.
