“为某人树立榜样”常见的英文表达有：
set an example for sb.
例句：Parents should set an example for their children by behaving honestly and kindly.（父母应该通过诚实和友善的行为为孩子树立榜样。）
be a role model for sb.
例句：The athlete's hard work and determination made him a great role model for young people.（这位运动员的辛勤努力和坚定决心使他成为年轻人的一个很棒的榜样。 ）