它们很害怕它用英文怎么说

它们很害怕是"they are afraid"。

来源：英语是一种语言，它的语法和单词是由英国人在不同历史时期编写和使用的。

例句：

They are afraid of spiders. (它们害怕蜘蛛。)
They are afraid to speak in pubpc. (它们害怕在公共场合发言。)
They are afraid of failure. (它们害怕失败。)