The word toys has two meaningful parts, toy and -s. The -s in this case denotes "plural", modifying the root word toy.
In contrast, the word orange has just one meaningful element (the word orange itself). It would not make sense to break it down further into, say, o + range.
There are 2 kinds of morphemes: free and bound.
Free morphemes can stand alone and have meaning independently.
Bound morphemes must be attached to a free morpheme, they cannot be used by themselves! For instance, you can't just go around saying "-s" to mean "plural".
What is the purpose of morphemes?
Morphemes can derive other words by changing their part of speech. The suffix -ful turns a noun into an adjective. The suffix -ly changes an adjective into an adverb.
Morphemes can also change the meaning of a word, like the prefix un- to mean not. The suffix -ed often represents the past tense when attached to a verb. Obviously, there are exceptions in the case of irregular verbs. The suffix -s can represent either plural when attached to a noun, or denotes third person singular when attached to a verb.
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