You'd have to be sad to wear a shirt like that.

　　你穿著那樣的襯衣顯得老氣。

　　I was very sad indeed to hear of your father's death.

　　聽到令尊大人去世，我感到非常難過。

　　How sad that all his hard work should come to nothing.

　　他的所有辛勤勞動竟全部付諸東流，太讓人傷心了。

　　The increase in crime is a sad reflection on our society today.

　　犯罪的增加令人遺憾地反映了當(dāng)今社會不太好的一面。

　　It's a sad fact that many of those killed were children.

　　讓人難以接受的是遇難者中很多是孩子。

　　It was sad to see them go.

　　看著他們離去，真讓人難過。