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Does anyone know of any fun ways to teach Grammar?

Oh yes. There are lots of activities to tach Grammar and have fun at the same time. I could give you lots of examples but I'll just mention one: have you heard of the activity "Find someone who...."? That's a very nice activity to practise question forms, verb tenses and modal auxiliaries. There's a very nice book (quite old though) called "Action Plans". It is full of fun grammar activities to teach, learn and practise different grammatical structures. If you liked to know more about it, just let me know!