Usage of singular 'they', 'their' and 'them' is the most common; and ze, sie, hir, co, and ey are used as well. Some others prefer the conventional gender-specific pronouns 'her' or 'him', prefer to be referred to alternately as 'he' and 'she', or prefer to use only their name and not use pronouns at all.
A simple pronoun has been voted Word of the Year and sparked outrage among some politicians. Fiona MacDonald looks at how grammar is at the vanguard of a gender revolution.
