Question

连接副词是连词还是副词

Answer 1

当然是副词了。
所起的功能是连接。
连接副词可分为两类，一类是用于连接句子或从句，常见的有therefore, besides, otherwise, however, moreover, still, thus, meanwhile等；另一类是用于引导从句或不定式，主要的有when, why, where, how 等。
例句：
I feel a bit tired. However, I can hold on.
我有点累了,但我能坚持下去。
They talked about it for hours. Finally, they decided to go。
他们对此商量了好几个小时,最后他们决定去。
I have never been to Wales. I, therefore, don't know much about it.
我从未去过威尔斯,因此我对它知道的不多。
The weather was cold. Therefore(Thus), we stayed home.
天气寒冷,因此我们待在家里。
They talked about it for hours. Finally, they decided to go。
他们对此商量了好几个小时,最后他们决定去。

Answer 2

连接副词是引导从句的副词。是副词，在从句中作状语。