This document discusses the use of the apostrophe s ('s) to indicate possession in English. It provides examples of how the apostrophe s is used to show possession of singular and plural nouns, irregular plurals, and possessors with multiple nouns. It also discusses how the apostrophe s is used with proper nouns, archaic terms, and whole sentences, as well as with somebody, somebody, institutions, countries, cities, measures of time, distance, and weight. The document notes some idiomatic uses and instances where the indication of possession can be omitted.

2.  My father´s book ( no article)
 My sisters´ house ( plural words)
 The children´s toys ( irregular plurals)
 John and Mary´s daughter (multiple nucleus)
 John´s and Mary´s books (different possessors)
 Charles´s shirt (proper names)
 Hercules´ labours ( archaic uses)
 The man I told you about´s idea (whole sentence)

3.  It´s mainly used to show possession; ex:
 Peter´s car
 It´s also used with someone, somebody, etc; ex:
Somebody´s shirt
 It´s used with the names of:
 institutions, ex: United Nations´ building
 countries, ex: Spain´s income
 cities, ex: Seville´s city hall
 It´s used with time, place, distance, measure, and
weight; ex: In three years´ time
 It´s used in some idiomatic expressions; ex:
For heaven´s sake

4.  The possession can be deleted:
 When we mean en casa de; ex: At Peter´s (house)
 When we talk about shops; ex: The baker´s (shop)
 With churches, cathedrals and hospitals; ex:
St. Paul´s (cathedral)
 To avoid double possession; ex:
This my car and that is my brother´s (car)