hear的过去分词形式是什么

　　例句

　　He could hear someone moving around in the room above.

　　他能听到楼上屋里有人走动。

　　It was three weeks later that he heard the news.

　　三个星期之后他才听到这个消息。

　　Many's the time I heard her use those words.

　　我不止一次听她说过那样的话。

　　This is the first I've heard of it!

　　这可是我第一次听说这件事！

　　She shouldn't have said such things in your hearing.

　　她不应该在你面前说这种事情。