Помогите составить 15 предложений по английскому. Первое предложение утверждение, второе отрицание, третье вопрос

Ann is the best pupil in the class.Ann isn`t the best pupil in the class.Is Ann the best pupil in the class?I have done my homework.I haven`t done my homework.Have I done my homework?You called me yesterday.You didn`t call me yesterday.Did you call me yesterday?I think I will buy that dress.I don`t think I will buy that dress.Do I think I will buy  that dress?I am walking with my friends now.I am not walking with my friends now.Am I walking with my friend now?