lest,for fear that 两个词用虚拟,但是后面难道不是用should吗?为什么看到有过去完成时的?

lest,for fear that 两个词用虚拟,但是后面难道不是用should吗?为什么看到有过去完成时的?
RT
用法我都知道.
Many applicants are hesitant to address an injury or illness for fear that the employer will see them as a potential insurance liability.
Regulators have ordered some banks to stop new loans until the end of the month for fear that frantic lending had been compromising monetary policy that most economists already considered too loose
如上两句,这个能算虚拟嘛?一个用will 一个用过去完成时.