The son is not good / bad to his old parents. 那个儿子对他年老的父母不好。 四。 “ be good at sth. ”和“ be good at doing sth. ”表示“善于,擅长于(做)……”,“ be good at sth. / doing sth. ”与“ do well in sth. / doing sth. ”结构相同,使用时要注...