I would appreciate it if 要用虚拟语气吗

I would appreciate it if 要用虚拟语气吗

I would appreciate it if 其后是否需要用虚拟语气要看if后面的从句。
用虚拟语气的情况，和现在事实相反，例如：I would appreciate it if the train could wait for me.如果火车能等我，我会谢天谢地。但是实际上火车不可能会单独等待一个人。
不用虚拟语气的情况，可能是能实现的。 I would appreciate it if the boss can give me bonus. 如果老板给我奖金，我会很很感激。这个情况是完全可以是现实的，所以不需要用虚拟语气，

得用条件状语,不一定虚拟语气,但是以用为主,如 i appreciate it if it could be arranged. 如果你们能安排,我将不胜感激. we appreciate it if you can cooperate with us. 如果贵方能与我方合作,不胜感激. we would appreciate it if you could offer us any help . 如果您能为我们提供帮助的话,我们将不甚感激.