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是什么時(shí)態(tài)?already不是用于完成時(shí)中嗎 這個(gè)句子又好像是進(jìn)行時(shí).

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

Along the way children dressed in long wool coats stopped to look at us.這里的dressed in long wool coats stopped to look at us 的 stopped為什么 用了過去時(shí) 和前面的dressed 是什么關(guān)系.

At one point we were so high that we found ourselves cycling through clouds.這里為什么是 find ourselves?有 find oneself 這個(gè)用法嗎,