Editing Morphophonology (section)

==Types of changes==
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Inflected and agglutinating languages may have extremely complicated systems of morphophonemics. Examples of complex morphophonological systems include:
* [[Sandhi]], the phenomenon behind the English examples of plural and past tense above, is found in virtually all languages to some degree. Even [[Mandarin Chinese|Mandarin]], which is sometimes said to display no [[morphology (linguistics)|morphology]], nonetheless displays [[tone sandhi]], a morphophonemic alternation.
* [[Consonant gradation]], found in some [[Uralic languages]] such as [[Finnish language|Finnish]], [[Estonian language|Estonian]], [[Northern Sami|Northern Sámi]], and [[Nganasan language|Nganasan]].
* [[Vowel harmony]], which occurs in varying degrees in languages all around the world, notably [[Turkic languages]].
* [[Ablaut]], found in English and other [[Germanic languages]]. Ablaut is the phenomenon wherein stem vowels change form depending on context, as in English ''sing'', ''sang'', ''sung''.