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。

　　We are very sad to hear that you are leaving.

　　聽說你要走了，我們十分難過。

　　Her moods kept changing ─ now happy, now sad.

　　她的情緒總是變幻不定——時而歡喜，時而憂傷。

　　It is very sad when children feel unwanted.

　　小孩覺得沒有人愛是很悲慘的。

　　You sad old man.

　　你這糟老頭子。

　　The sad news cast a shadow over the proceedings.

　　這個壞消息給事件的進程蒙上了一層陰影。

　　The book is, by turns, funny and very sad.

　　這部書時而妙趣橫生，時而悲悲戚戚。

　　We had some sad news yesterday.

　　昨天我們聽到一些不幸的消息。