当hear作“听说”解时，通常使用 hear that 或者 hear it said that 句型，其中的 that 也可以省略；没有sb is heard to do 或 sth is …
hear sb do sth表示“听到某人做了某事”，hear sb doing sth.表示“听到某人正在做某事”，一些感观动词如hear, see, feel, watch等后面 …
是 hear sb to do 还是 hear sb do 还是 hear sb doing？ 区别是什么？ 只有两种说法： hear sb do sth------听到某人做了某事， …
hear sb doing sth 听到某人在做某事. 以此类推... I heard someone knocking at the door when I fell asleep. (我入睡时有人正敲门,强 …
We can use either the infinitive without to or the -ing form after the object of verbs such as hear, see, notice, watch. The …
更多内容请点击：be heard to do sth 与 be heard done 用法的疑惑 - 柯帕斯英语网