Between my 9yo DS1 and I? On one of his computer games, there is a sentence that reads : A gang of vicious muggers is running through the town. I insist that the sentence is gramatically correct. DS1 is insisting that the sentence should read : A gang of vicious muggers are running through the town.
I have tried to explain to him that if the sentence was : Vicious muggers are running through the town, then are would be correct, but a gang makes it a collective singular doesn't it? I'm probably totally wrong, as it's been far too long since I have had to think about things like this, so could you settle this for us please?