def check_blockquote(line):
    """ Check whether the line is blockquote, if it is, change it into html format

    :param line: str, a line in markdown syntax
    :return: str, the line in html format with block quote
    """

    if len(line) > 2 and line[:2] == '> ':
        return '<blockquote class=\"blockquote\">' + line[2:] + '</blockquote>'
    else:
        return line