He was empathizing with his friend as they shared their struggles.

empathizing 是动词 empathize 的现在分词形式。empathize 由前缀 em-（表示"进入...状态"）和 pathy（源自希腊语 pathos，意为"感受、情感"）组成，字面意思是"进入他人的情感状态"，即"共情、感同身受"。