Why is the past tense of “may”, “might”?

Why is the past tense of may, might?
When you see other past forms of auxiliary verbs, they usually have -ould, like should, could, and would. Unlike other forms, the past tense of may is might not mought.

Answer

With the German forms mögen (infinitive), er mag ( he may), er mochte/er möchte (he might) you may get an idea about historical sound changes.
The German stem mag/mög has a regular past with -te, but g changes to ch, which is easier to speak before t.

In English g vanishes, but y in may reminds us that there was a g. English might is parallel to German mochte/möchte. But in English the g-sound vanishes and only the spelling gh is a hint at the original g-sound.

Attribution
Source : Link , Question Author : lala , Answer Author : rogermue

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