input: Write a function to print the top 5 most frequent words in a given sentence. The function should split the sentence into words, count the frequency of each word, and return the top 5 words along with their frequencies. If the given sentence is empty, the function should return an empty list.
  
  assert top_5_frequent_words("Python is an interpreted, high-level, general-purpose programming language.") == [('Python', 1), ('is', 1), ('an', 1), ('interpreted,', 1), ('high-level,', 1)]
  assert top_5_frequent_words("The quick brown fox jumps over the lazy dog.") == [('The', 1), ('quick', 1), ('brown', 1), ('fox', 1), ('jumps', 1)]
  assert top_5_frequent_words("") == []
output: def top_5_frequent_words(sentence):
      if not sentence:
          return []
      words = sentence.split()
      freq = {}
      for word in words:
          if word in freq:
              freq[word] += 1
          else:
              freq[word] = 1
      sorted_words = sorted(freq.items(), key=lambda x: x[1], reverse=True)
      return sorted_words[:5]