it's time we take better care of the environment是虚拟语气?为什么?
4个回答

写错了吧?从句中是不是took啊?

"该做某事了"涉及到从句的句型有两个:

(1)It is time that sb did sth.(从句中用过去时.这是一个与事实相反的虚拟,暗示这件事该做了,但还没有做.)

(2)It is time that sb should do sth.(这个不是should型虚拟,而是取了should的基本含义,所以should不能省.)