应该说“They are out for holiday”还是"They are out on holiday",为什么

问题描述:

应该说“They are out for holiday”还是"They are out on holiday",为什么
那可以说“They are away for holiday."还是”They are away on holiday."

两个都可以,但意思不同
前者是他们出去度周末,后者是他们周末出去了