小说《Babbitt》中：He seemed prosperous, extremely married and unromantic; and altogether unromantic appeared this sleeping-porch, which looked on one sizable elm, two respectable grass-plots, a cement driveway, and a corrugated iron garage. Yet Babbitt was again dreaming of the fairy child, a dream more romantic than scarlet pagodas by a silver sea.
1 句首的 Yet 到底是做并列连词还是连接副词？或者两种分析都可以？
2 which非限制性定语从句修饰this sleeping-porch吗？
当yet作“然而；但是”解时，词典一般把其处理为“conjunction(连词）"，也有处理为“conjunct(conjunctive adverb)（连接副词）”的。作连接副词时，大多见于although/though……,yet……或and/but yet场合。例如：
1）Although/Though he is poor,yet he's satisfied with his situation.
2）lt is strange,and yet it is true.
3）l agree with you,but yet l can't consent.