In English, the phrase "好伤心" would be translated as "sad" or "heartbroken." The word "sad" comes from the Old English word "sæd," which means "full of sorrow." Here are some example sentences using the word "sad" in English:

"I feel so sad that I can't be there for your graduation." (我很伤心我不能在你的毕业典礼上。)

"The news of her sudden death was very sad." (她突然去世的消息非常伤心。)

"The ending of that movie was so sad that I had to wipe away tears." (那部电影的结局非常伤心，我不得不擦掉眼泪。)

The word "heartbroken" is used to describe a feeling of extreme sadness or grief. It comes from the combination of the words "heart" and "broken," which refers to the feeling of having one's heart shattered or broken into pieces. Here are some example sentences using the word "heartbroken" in English:

"I was heartbroken when my dog passed away." (我的狗去世时我非常伤心。)

"She was heartbroken when her boyfriend broke up with her." (她的男朋友和她分手时她非常伤心。)

"He was heartbroken after his team lost the championship game." (他的球队输掉了冠军比赛后他非常伤心。)