I think a snake is a good pet for a 16-year-boy 句子结构
句子语法结构分析
主语：I
谓语：think
引导宾语从句连接词：that （已经省略）
宾语从句：a snake is a good pet for a 16-year-old boy
从句主语：a snake
从句系动词：is
从句表语：a good pet
从句后置定语：for a 16-year-old boy