The government has campaigned to raise adult literacy levels

Breakfast tested your grammar this morning. We asked whether you knew your colon from your hyphen or if you knew where to stick your apostrophe.

So, does it all matter?

Our guest Lynne Truss thought so, she said we've got ourselves into "Punctuation Anarchy".

She has written a book on the subject, "Eats, Shoots and Leaves"

Click here to watch Lynne Truss

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Lynne Truss says she never expected the book to be a success, publishers thought it was for a niche market, but somehow the book and the way it is written has really captured the market.

Lynne talks about punctuation marks as characters: the exclamation mark has no volume control and should not be used by comic writers. It can also be used to indicate self effacement.

She says the title of the book comes from a joke about a panda going into a bar and ordering a sandwich, it then fires a gun and walks out of the pub. The barman asks him why - and the Panda throws him a badly punctuated wildlife book and tells him to look up Panda. The barman turns to the right page and reads "Panda: Bear-like mammal native to China. Eats, shoots and leaves".