its driver had a lot of trouble trying to stop it能不能改成：to try to stop it
问题描述：
its driver had a lot of trouble trying to stop it
能不能改成：to try to stop it
答
this driver had a lot of troubles trying to stop it.
答
是不能的
have trouble in doing sth.是一个固定句式,in可省略可不省略
在你的句子中,in是省略了的