Possession case "s"

[Rida*]

Hello Sir,

Yesterday i have asked my question about apostrophe(,s),that i have read that ,s can not be used with lifeless things i.e "a chair,s leg is broken" is not right instead "leg of the chair is broken"is right.but my problem is that at many places i have also read the possession case(,s) with lifeless things.How can i know where to use ,s and where not(with lifeless things).

A reply was given to me but my concept is not clear yet.Please explain me in detail.Thank you.

[Mister Micawber]

Yes, the rule is that -'s is used only for sentient or sentient-like things, and yes, this is not a strict rule. It is a good idea to avoid -'s with chairs and other non-living (and sometimes non-human) subjects in formal English.
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Native English teacher at Mister Micawber's