Using three lists of words: subjects, verbs, and objects, as given below, write a Python program to generate all the grammatically correct sentences with subject, verb and object by ensuring appropriate subject-verb combinations. Some of the restrictions are

• "am" is used only with the subject "I."
• "Is" is used only with "He," "She," and "It."
• "are" is used only with "We" and "They."
• "Was" is used only with "I," "He," "She," and "It,"
• "were" is used only with "You," "We," and "They."

Use the following line of code to start:
subjects = ["I", "You", "He", "She", "It", "We", "They"]
verbs = ["am", "is", "are", "was", "were", "will be", "have been", "had been"]
objects = ["happy", "sad", "angry", "hungry", "tired", "excited", "scared"]