The general rule is that, when talking about things, you use its for singular and their for plural. Their can have a distributive meaning, so most of the employees prefer to eat their lunch at their desk is the preferred construction. 8 their x just means x belongs to multiple people.
There is one exception relating to their, for which the oxford dictionary defines. What is the difference between their and theirs, and how is should use them? Sometimes i get frustrated, because i do not see their difference.
3ătheirïŒtheiræŻć€æ°çŹŹäžäșșç§°çæææ ŒćœąćŒ,æŻć€æ°ćœąćźčèŻæ§ç©äž»ä»ŁèŻ,ćšć„äžćȘćŻçšäœćźèŻ,ć ¶ććžžæ„〿°ćèŻă ææ¶äžșäșéżć æŸç€șæ§ć«, theirèżćŻä»Łæżhis, herçšäœanybody, anyone, everyone. If each of the their has an x, then you are talking about multiple xs, and should use the plural form of x. Why can we use 'their and what's the difference if instead of their we use his/her? Someone has forgotten their book.
If everyone in the their group. ThemïŒtheyïŒtheirćć«ä»äčçšæłïŒ1ăćšć„äžçæćäžćïŒthem (ä»ć„čćźä»Ź)æŻtheyçćźŸæ ŒïŒäžèŹćšä»èŻć their (ä»ćźć„č仏ç)æŻtheyçćœąćźčèŻæ§ç©äž»ä»ŁèŻïŒćéąć ćèŻ they (ä»ćźć„č).