1. As Tess,full of enthusiasm,came downhill towards the dairy,she suddenly heard the milking call,again and again, from all parts of the valley．

【要点解析】这个句子是含有时间状语的复合句。时间状语从句是as Tess, full of enthusiasm, came downhill towards the dairy，主句是she suddenly heard the milking call,again and again, from all parts of the valley。

从句中的full of enthusiasm是形容词短语作伴随状况状语。苔丝come downhill towards the dairy这个动作发生的同时，伴随着她full of enthusiasm的心里状态。

主句中的again and again是副词性短语作时间状语，from all parts of the valley是借介词短语做地点状语。注意时间状语为地点状语前面。

2. Tess followed the red and white animals,with their great bags of milk under them,into the farmyard．

【要点解析】with great bags of milk under them是介词短语定语修饰名词animals。With在这里的意思是“具有，有”。

3. She saw the long sheds, and the wooden posts, shining and smooth where the cows had rubbed against them over the years．

【要点解析】这是一个含有定语从句的复合句。主句是：She saw the long sheds, and the wooden posts。定语从句是where the cows had rubbed against them over the years。这个从句是有关系副词”where”引导的分隔式限定性定语从句，修饰表示地点的先行词 sheds和posts。
在主句和从句中的shining and smooth是形容词短语作宾语sheds和posts的补足语。