input: 
  class StringCaseModifier:
      def __init__(self, string):
          self.string = string
  
      def to_upper(self):
          return self.string.upper()
  
      def to_lower(self):
          return self.string.lower()
      
      def to_title(self):
          return self.string.title()
  
  if __name__ == '__main__':
      test_string = 'Hello World'
      string_modifier = StringCaseModifier(test_string)
      print(string_modifier.to_upper())
      print(string_modifier.to_lower())
      print(string_modifier.to_title())
  
  
  Create a question for the above code in the format you requested. 
  
  The function name should be modify_string_case, and it should take a string as input and modify its case according to the provided class. Include specific test cases with expected outputs.
  
  def modify_string_case(string: str) -> dict:
      """
      Modify the case of the input string using the StringCaseModifier class and return a dictionary with the modified cases.
      The dictionary should have the following keys: 'upper', 'lower', 'title'.
      
      >>> modify_string_case('Hello World')
      {'upper': 'HELLO WORLD', 'lower': 'hello world', 'title': 'Hello World'}
      >>> modify_string_case('python 3.8')
      {'upper': 'PYTHON 3.8', 'lower': 'python 3.8', 'title': 'Python 3.8'}
      """
output:     
      string_modifier = StringCaseModifier(string)
      return {
          'upper': string_modifier.to_upper(),
          'lower': string_modifier.to_lower(),
          'title': string_modifier.to_title()
      }
  