In the following sentence:
誰{だれ}探{さが}してんの
What is the grammatical reason for 探{さが}す to be used in て-form before ん?
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Sign up to join this community誰探してんの is a contracted form of 誰探してるの, which in turn is a contracted form of 誰(を)探しているの ("Who are you looking for?", notice the progressive form). More generally:
/r/ + vowel
before a /n/ consonant can turn into ん in casual speech. (Do not confuse this ん as explanatory-の.)Examples:
Related:
EDIT: By extension, るんだ/るんじゃ can contract to んだ/んじゃ (informal and slangy).
According to the site below, it is the dialect of Osaka.
https://www.weblio.jp/content/てん?edc=OSAKA
Examples:
Osaka: なにしてん
Tokyo: なにをしているの
Osaka: なにしとん
Tokyo: なにをしておるの