1. I need to know if this form exists or not and if so how? 2. on what ground?
3. Was being rude to somebody!
Is the sentence grammatically correct? Which sentence are you referring to? I have numbered them 1, 2 and 3 above - please give the number of the sentence that you want us to check, and say what you are not sure about. (Please note that 2 is not a full sentence, by the way.)