input: Write a python function to generate a question from a given sentence.
  assert generate_question('The sky is blue') == 'What is the sky is blue?'
  assert generate_question('Python is a programming language') == 'What is the Python is a programming language?'
  assert generate_question('The cat sat on the mat') == 'What is the cat sat on the mat?'
output: def generate_question(sentence):
      return f"What is the {sentence}?"