你好.你的两个表达都是错的.
第一个结构混乱,根本不存在.
第二个结构中Actions必须换成不可数名词单数. 应该成为：Action must be taken to do sth.这是被动语态结构.
另外,Action must be taken to do sth.
== Steps must be taken to do sth
===Measures must be taken to do sth.
(必须采取行动/步骤/措施做某事)