hold on to sth hold up to

hold on to sth hold up to hold on ,hold up,hold to,hold out分别 Hold on to or give up hold on to do sth 还是hold on to doing sth hold on to do sth hold on to doing sth ,哪个对 hold on to doing sth 还是hold on to do sth hold up to daily Hold on to your hold on to a hold on to forever hold on to the hold on,hold onto,hold to有什么区别呢?