do sth to do/doing sth这个后面的to do/doing sth都是后置定语吗?区别在哪?

do sth to do/doing sth这个后面的to do/doing sth都是后置定语吗?区别在哪? practice doing sth.和practice to do sth.的区别 start doing sth.和start to do sth.的区别 stop doing sth与stop to do sth的区别 begin to do sth./doing sth.的区别在于? refuse to do sth和refuse doing sth的区别 forget doing sth 和 forget to do sth的区别 love to do sth和 love doing sth的区别 stop to do sth 和stop doing sth的区别? like to do sth和like doing sth的区别 prefer to do sth.& prefer doing sth.的区别 like to do sth 和like doing sth 的区别?