Suffixes are commonly used to show the part of speech of a word. For example, adding "ion" to the verb "act" gives us "action," the noun form of the word. Suffixes also tell us the verb tense of words or whether the words are plural or singular. ... The spelling of a base word can change when a suffix is added.

Why do we use suffixes at the end of words?

Adding suffixes to words can change or add to their meaning, but most importantly they show how a word will be used in a sentence and what part of speech (e.g. noun, verb, adjective) the word belongs to.

What is a suffix What does it do?

A suffix is a group of letters which can be added to the end of a word. A suffix cannot be used alone, and using one will change the meaning of the word it is attached to – but in a way that is different to how prefixes change the meaning of a word.