say to sb. 跟某人说...
talk with/to sb. 跟某人谈话
talk about sth 谈论某事
speak to sb. 跟某人讲话（打电话用语）
tell sb. sth= tell sth. to sb. 告诉某人某事
tell sb. about sth. 告诉某人关于某事
tell sb. to do sth 告诉某人做某事
tell a story 讲故事
tell a joke 开玩笑
tell a lie 撒谎
tell the truth 说出事实
tell the differences 分辨出不同