✔ 最佳答案
你好，请看以下的解释。。。
The children will have lunch at school tomorrow. ---> Simple Future Tense
The children will be having lunch at school tomorrow. ---> Future Continuous Tense
请你看
http://hk.knowledge.yahoo.com/question/question?qid=7009051401188，里面有所有 Tenses 的结构。
也请你看
http://hk.knowledge.yahoo.com/question/question?qid=7009051701743，里面我有提到你以上的结构。
若有不明白，你随时再发问过，好吗？
希望能帮到你咯。。。: )
2009-06-02 14:33:03 補充：
The children will have lunch at school tomorrow. 是讲述着未来的事物，也就是明天那些小孩们会在学校里吃午餐，这是一个简单的未来事物/动作。
反而，The children will be having lunch at school tomorrow. 是在讲述着未来正在发生的事，也就是明天那些小孩们会在学校里吃“着”午餐。
如果你有看以上我所提供的网址，你应该会看到我有曾经解释过 Future Continuous Tense 的用法。
2009-06-02 14:34:32 補充：
我们通常用 future continuous 在一些我们未来时正在做着的某些事物，也就是说 we will be in the middle of doing something 咯。
1) This time next week I'll be on holiday. I'll be lying on the beach or swimming in the sea.
2) Don't phone between 7 and 8. We'll be having dinner.
2009-06-02 14:34:44 補充：
3) At 10 o'clock tomorrow, she will be in her office. She will be working.
若还有疑问，你随时再问我，好吗？
