def adaptMetricsInterval(metrics, interval):
    """Transforms the selected metrics and the time interval (daily, weekly, etc.) into a understandable metrics
    Parameters:
    -----------
    metrics : str list
        list of cumulatives selected metrics

    interval : str
        time intervall (daily, weekly, biweekly, monthly, or none)

    Returns
    -----------
        M : str list
            the list of correspondiing metrics
    """
    if interval == None:
        I = ''

    else:
        I = interval

    M = [I + metric if metric in ['Cases', 'Deaths', 'Tests'] 
        else metric for metric in metrics ] 

    return M