input: Write a function to generate a list of lists of words from a given list of strings. Each sublist should contain the first word followed by the following words for each string. If the input list is empty, return an empty list.
  
  def get_word_lists(strings):
      word_lists = []
      for string in strings:
          words = string.split(" ")
          word_list = [words[i:] for i in range(len(words))]
          word_lists.append(word_list)
      return word_lists
  
  assert get_word_lists(["Hello world", "This is a test"])==[["Hello", "world"], ["This", "is", "a", "test"]]
  assert get_word_lists([])==[]
output: def get_word_lists(strings):
      word_lists = []
      for string in strings:
          words = string.split(" ")
          word_list = [words[i:] for i in range(len(words))]
          word_lists.append(word_list)
      return word_lists