"wake sb up"和wake up sb.都是叫醒某人,
如果是人名,就说wake up sb,
如果是代词,就说wake sb up
如：Please wake up Charlie at six o'clock tomorrow.morning.
Please wake him up at six o'clock tomorrow morning.
另外,wake up,xxx!
还有“叫某人清醒,别糊涂了.”的意思
如：wake up,my dear friend!move on with your life.
动副短语的中心词是名词时,名词放中间和放后面没有区别,如果中心词是介词则只能放中间.