what if不用虚拟语气吗?那为什么后面总是加should 呢 e.g .————what if i should f

what if 后面是否跟一般现在时 它是虚拟语气吗? what if用于虚拟语气吗? what __you do if you ___ up 为什么不用虚拟语气? If it should snow tomorrow,they couldn’t go out.这是虚拟语气吗?为什么? 虚拟语气中,Should引导的if条件句,should只能用在将来式的条件句中,并且是should+动词原型.那为什么会 I don't know ——— I should bring a present.A.whom B.if C.what 为什么as if虚拟语气表将来有两种情况 一种是should/could/might+do 一种是加一般过去式 If I have a good chance .what should I do? If I want to master English,what should I do What should I say if I love you If i want to buy LCD,what should i know? What If I Should Say I Love You 歌词