1. It exploded loudly with fire and rock, which were in time to produce the water vapour, carbon dioxide, oxygen, nitrogen and other gases, which were to make the earth' s atmosphere. 它（地球）巨大的爆炸喷出了烈火与岩石。最终产生了水蒸气、二氧化碳、氧、氮和其他多种气体，从而形成了地球的大气层。

　　"be+不定式"结构通常用来表示"按计划或安排将要做的事情"，或表示上级对下级、父母对子女下命令，"应该做某事"或表示某事"将必然发生"。

Here is a message for you from your head teacher: you are to go to her office after class.

你的班主任给你一个口信，要你下课后到她的办公室去。

The worst is still to come. 更糟糕的事情还会发生。

We' ll hold a meeting tomorrow. = We are to hold a meeting tomorrow. = A meeting is to be held tomorrow.

我们明天将开会。

The train is to arrive in Beijing at 10: 25 am. 这趟火车将于上午10: 25到达北京。

完成句子或翻译。

1. 你的班主任给你一个口信，要你下课后到她的办公室去。

Here is a message for you from your head teacher: you ______ ______ ______ to her office after class.

2. The worst is still ______ ______ (come).