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。