This KS2 English quiz will challenge you on pronouns. A pronoun is a word which replaces a noun. "Helen, Tom and Nadia decided to share Helen's, Tom's and Nadia's toys" sounds ridiculous! It's much better English to say, "Helen, Tom and Nadia decided to share their toys." The word 'their' is a pronoun, like 'he' and 'his', 'she' and 'her', 'you' and 'your', and 'I' and 'my'. Other pronouns include 'it'.
The majority of people naturally use pronouns when speaking. It certainly helps to use them in your writing as it shortens what might be a very lengthy sentence!
See how well you understand pronouns by trying this English quiz.