二、prepare用作不及物动词时:
prepare for sth.表示"为......做准备"。
The students are busy preparing for the final exam.
学生们正在准备期末考试。

三、prepare的名词形式为preparation，可以用于以下一些短语:

①make preparations for 为……做准备
She is making preparations for her marriage.
她正在为自己的婚事做准备。

②in preparation for  为……做准备
We're getting things together in preparation for the journey.
我们正在收拾东西准备旅行。

③make preparations against sth.  为对付/防止……做准备
We must make preparations against natural disasters.
我们必须为防止自然灾害做准备。