我知道代词用来引出被指代的事物时可以,如:This is my friend Tom. It is a lovely dog. 等这次又看到一句话:The writer tells us to keep it shut if the door of the room is warm.这句话中it指代的是door。现问题如下:上面这句话it可以这么使用吗...
as if的虚拟语气表对现在的虚拟用were或did,是否可以既表示虚拟又表示进行或完成?例:It seems as if he is leaving.他好像要走。这句话变虚拟语气可以直接把is变成were吗?例:It seems as if he is doing his homework.他好像在做作业。这句话...