def text_from_tagged_ngram(ngram):
    if type(ngram) == tuple:
        return ngram[0]
    return " ".join(zip(*ngram)[0]) # zip(*ngram)[0] returns a tuple with words from a (word,tag) list

return " ".join(list[zip(*ngram)[0]])
TypeError: 'zip' object is not subscriptable

list(zip(*ngram))[0]

next(zip(*ngram))