1. “These are ready now”, and so saying, d’Urberville picked one and held it to her mouth．

【解析】so saying是现在分词短语做伴随状况状语。

这个现在分词短语采用了倒装结构，so+非谓语动词（saying）。

2. She did not know as she smiled innocently at the flowers that behind the cigarette smoke was the cause of future sorrow in her life．

【解析】这是一个含有时间状语从句的复合句，主句是：She did not know that behind the cigarette smoke was the cause of future sorrow in her life；时间状语从句是：as she smiled innocently at the flowers。

在主句中又含有宾语从句：that behind the cigarette smoke was the cause of future sorrow in her life。

宾语从句采用了倒装形式。是把介词短语behind the cigarette放于句首，然后接谓语was，在接主语the cause of future sorrow in her life。这个倒装结构是：介词短语+系动词+主语。

此外，future是修饰cause，in her life是修饰sorrow。

由于宾语从句长于时间状语从句，就把时间状语从句前置于主句中的谓语动词“know”后，因为这个从句就是起着副词的作用，修饰谓语动词的。