关于英文when的词性在我的词典中when有三种词性,adv,conj,pron.但是我的词典中所给的例句比较混乱.请问

(1)He came at six, when the sun was setting. He came at a time when we needed help. 这两句可不可以理解为when引导的从句修饰的是six和a time。这是什么类型的从句？ (2)His wife always complains when he smoke. He came at a time when we needed help. She smiles when you praise her. 这不都是状语从句么？您能不能详细说明一下。 (3)He came at six, when the sun was setting. when前面加逗号是什么从句？