def get_workflow_status_change_verb(status):
    """Give the correct verb conjugation depending on status tense.

    :param status: String which represents the status the workflow changed to.
    """
    verb = ''
    if status.endswith('ing'):
        verb = 'is'
    elif status.endswith('ed'):
        verb = 'has been'
    else:
        raise ValueError('Unrecognised status {}'.format(status))
    return verb
