茉莉芬芳2008
首先第一个问题，我觉得两者在这里是可以通用的。doing强调的是我一直在说，而to do就没有这层含义。那如果用 I started to talk to another guy in the bank，这里连续两个to，显得有些奇怪。这是我自己的理解。关于你的加不加to的问题。并不是不做谓语就不要加to的，加不加to就是根据它是不是及物动词来判断的。这里的talk是不及物动词，那么他后接人做宾语就要加to。然后再来给你分析一下这句句子的成分：I | started | talking to another guy | in the bank.I 是主语，started是谓语，talking to another guy是宾语，in the bank是地点状语。然后再看talking to another guy:talking to | another guyanother guy是talk to的宾语。
脸红红1121
start 可做及物动词，也可做不及物动词。这里start doing sth. 也是固定搭配之一。意思是“开始做……”talking to another guy in the bank整个就是started这个动词的宾语。也就是动宾结构。
小苏果果
She often tlak about her new friend with classmates. Teachers often refer to that new student. I don't enjoy(like) his lecture.
