def quote_normalization(question):
    """ Normalize all usage of quotation marks into a separate \" """
    new_question, quotation_marks = [], ['“', '”', '``', "''", "‘‘", "’’","'", '"', '`', '‘', '’']
    for idx, tok in enumerate(question):
        for mark in quotation_marks:
            tok = tok.replace(mark, "\"")
        new_question.append(tok)
    return new_question