Question

then he smiled,turned to henry and said quietly,"bicycles"...smiled,turned to 分别是什么句子成分，

smiled后面要加逗号，，，，turn改成现在分词行吗

Answer 1

then he smiled,turned to henry and said quietly,"bicycles"...smiled,turned to 分别是什么句子成分，

解答：以上句子结构，turned to henry and said quietly 和前面smiled 是三个并列谓语，其中前面一个逗号，相当于AND 功能

如果用现在分词短语表达的话，那就是做伴随状语了，可以这样改写

Then he smiled, turning to henry and saying quietly "bicycles....（现在分词做伴随状语）

Answer 2

这是三个并列的谓语动词，最后一个用 and 连接， 要把turn 改成现在分词也可以，但也得把say 变成现在分词，来做伴随状语。
then he smiled,turning to Henry and saying quietly,"bicycles"