“如果道歉有用的话”用英语怎么说？完整的

是流星花园中,道明寺经常说的话吧!!!
if appologize works, what will the police do?
if appologize works, what do you think the police need to do?

If it would be helpful to say sorry,...
我觉得在此用useful并不如helpful合适，因为useful重在说明用途，而这里的意思是“对事情有帮助”，所以我选择了helpful;works也行。

If saying sorry is useful

If apologising is useful

if an apology works,what's the hell is the police doing?

apologize 是动词
apology 是名词

这里要用名词

If apologize what useful words , that want the police to come too to do