英语语法和结构问题nearby a stream flows past a small pagoda,at the fo

答：你前面两句的句法分析完全正确!
由四川过湖南去,靠东有一条官路.这官路将近湘西边境到了一个地方名为“茶峒”的小山城时,有一小溪,溪边有座白色小塔,塔下住了一户单独的人家.这人家只一个老人,一个女孩子,一只黄狗.
The highway running east from Sichuan to Hunan comes, just west of the border, to Chatong, a small town in the hills. Nearby a stream flows past a small pagoda, at the foot of which lives a solitary household: an old man, a girl and a dog.

on,in,past,这些词,后面有名词短语时,是介词,没有则为副词.