input: Write a python function to reverse the words in a list of sentences.
  assert reverse_sentences(["Hello world!", "I am learning Python!", "How are you?"]) == ["!dlrow olleH", "!nohtyP gninrael ma I", "?uoy era woH"]
  assert reverse_sentences(["Python is fun!", "This is a test"]) == ["!nuf si nohtyP", "tset a si sihT"]
  assert reverse_sentences(["Good morning", "Have a great day!"]) == ["gninrom dooG", "!yad taerg a evaH"]
output: def reverse_sentences(sentences):
      return [sentence[::-1] for sentence in sentences]