I am making a phone call. He is doing his homework. We are making a cake now. Надо написать эти предложения в вопросительном виде и отрицательном)) помогите))

Am I making a phone call? I am not making a phone call.  Is he doing his homework?  He is not doing his homework.                                                                                                                   Are we making a cake now? We are not making a cake.