Question: how many parts of speech exist in english grammar
[{'answer': 'Eight', 'provenance': [{'wikipedia_id': '49610', 'title': 'English grammar', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 5, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '49610', 'title': 'English grammar', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 317, 'bleu_score': 0.955027111100031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3784486587034926345}, 'section': 'Section::::Abstract.'}]}]