sad的副詞是sadly還是saddly

　　例句：

　　We were all sad at her going.

　　我們對她的離去都很難過。

　　I overreact to anything sad.

　　我對任何悲傷的事情都反應過激。

　　She looked sad and tired.

　　她看上去又傷心又疲憊。