what if用于虚拟语气吗?

what if用于虚拟语气吗? what if 后面是否跟一般现在时 它是虚拟语气吗? 虚拟语气的从句可以不用虚拟语气吗?例：Even if he were himself, he should not know what to do.这后半句可不用虚拟吗? 虚拟语气一定有if吗 if 都用虚拟语气吗 if的虚拟语气 what would happen if...中would是什么意思是虚拟语气吗？ what if 的用法这是虚拟语气么？ 没从句的虚拟语气用法what if someone offered me a cigarette?中为什么要用offered而不用offer?这句话是虚拟语气吗? if应到的从句也要用虚拟语气吗?If you were arrested,what will the policeman ask you? 情态动词+ have done一定用于虚拟语气吗 If only 的句型用虚拟语气吗?虚拟语气的时候又是什么样的 if 从句和虚拟语气 as if 的虚拟语气? What's the first thing you'd do if you were going to build a house?它是虚拟语气吗? 十万火急::Besides,what would you have done if you were in my shoes?过去的虚拟语气吗?怎么用 英语翻译一般来说,IF后面要用虚拟语气吗? If 后不用虚拟语气一定要用一般现在时吗?