We're all taught the importance of correct grammar and spelling at school.
But a new test by Playbuzz has left many adults stumped despite it being designed for children aged between 11 and 12.
The language test certainly puts you through your paces, consisting of a series of tricky questions relating to spelling and grammar, according to the Daily Mail.
It also tests you on definitions, and in particular words that are commonly confused.
So, just how good is your spelling and grammar? Take the test below to find out. Scroll down for an explanation of the trickier answers.