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