他们非常悲伤用英语怎么说

他们非常悲伤可以用英语说成 They are very sad。
这个表达的来源是，sad 是形容词，意思是悲伤的；very 是副词，意思是非常；they 是代词，代指他们。因此，将这三个词结合在一起，就可以表达出他们非常悲伤的意思。
下面是一些例句：
They are very sad because their dog passed away. 他们非常悲伤，因为他们的狗去世了。
She was very sad when she heard the news. 她听到这个消息非常悲伤。
He felt very sad after he broke up with his girlfriend. 他和女友分手后感到非常悲伤。