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

你穿着那样的衬衣显得老气。

《牛津词典》

Don't be sad for the falling leaves.

不要为落叶而伤心。

youdao

As a zoology professor, I agree with Emma Marris that zoo displays can be sad and cruel.

作为一名动物学教授，我同意艾玛·马里斯的观点，即动物园的展览可能是悲剧的、残忍的。

youdao

Then,the Crimean War broke out. I felt that sad for him that there had to be a war.

VOA: special.2010.03.27

I am going to be sad when they finally get a name for it.

我会感到很伤心的,如果他们最后给它起名的话。

麻省理工公开课 - 固态化学导论课程节选

Maybe you could be talking with another friend, who's very sad that the former friend is getting married.

可能你在和另一个朋友聊天，他对刚才那个朋友结婚的事感到难过。

When 课堂 - SpeakingMax英语口语达人

The paintings themselves might be sad-eyed clowns on velvet purchased at a parking lot art fair.

FORBES: The Frame Game

Would you be sad to fold up your local paper for the last time?

FORBES: You Saw It on the News--But Not in a Newspaper

Nevertheless, I will be sad to see Taymor go, if the reports are true.

FORBES: Julie Taymor Reportedly Leaves Spider-Man