be made to take..如何理解？

In the heavy rain, people were made to take shelter in the nearest possible shop.

1.例句中被动的 were made to take 还是让某人做某事的结构吗， 该如何理解它？

2.in the nearest possible shop 是修饰shelter的吗，possible在这里该如何翻译？

In the heavy rain, people were made to take shelter in the nearest possible shop.

1. 主动式：made people take shelter；被动式：people were made to take shelter（大家被迫避雨）

2.in the nearest possible shop 是修饰 shelter 的定语。possible 常常与最高级连用，仍然是“（最）可能的”。因为前面有了最高级，possible 可以不必译出。