Question

知识点四 hear sb. do sth.与 hear sb. doing sth.

hear sb. do sth.意为“听到某人做某事”，指经常性听到某人做某事；hear sb. doing sth. 意为“听到某人正在做某事”，指某事正在进行之中。

4.  (翻译) 我们可以听到他正在隔壁唱歌。

We can hear in the next room now.

Answer 1

4. him singing