过去式 heard，过去分词 heard，现在分词 hearing，第三人称单数 hears
She felt frightened because she heard footsteps behind her.
她感到害怕，因为她听到身后有脚步声。
2
I haven't heard from him for a long time.
我已经很久没有他的消息了。
3
The procuratorate should hear the case impartially.
检察院应秉着公正的态度去审理案件。
