Although it was autumn,the snow was already beginning to fall in Tibet. 后面的the snow was already beginning to fall in Tib

Although it was autumn,the snow was already beginning to fall in Tibet.   后面的the snow was already beginning to fall in Tibet是什么时态?already不是用于完成时中吗 这个句子又好像是进行时.

Our legs were so heavy and cold that they felt like blocks of ice.这里的 blocks of ice

Along the way children dressed in long wool coats stopped to look at us.这里的dressed in long wool coats stopped to look at us 的 stopped为什么 用了过去时 和前面的dressed 是什么关系.

At one point we were so high that we found ourselves cycling through clouds.这里为什么是 find ourselves?有 find oneself 这个用法吗,