be skeptical of 怀疑
什么是虚拟语气？
一. 本质是什么——
二、考点
第一讲：
if的用法
过去 if+sb+had done sb + would/could/might/should + have done 对过去进行虚拟
现在 if+sb+be were/do did sb + would/could/might/should + do（动词原形） 对现在进行虚拟
将来 if+sb+过去式（were/did）/were to do sth/should do sb+would/could/might/should +do（动词原形） 对将来进行虚拟
【扩展】将来时的表示
1. will do
2. be to do
3. shall do
4. be about to do
第二讲
【单词扩展】
blurt out 脱口而出
1. if 从句 + 从句 / should，had，were 如果出现这些就会出现倒装
if的省略用法
【例】
if I were you，I would go out and play （如果我是你，我就出去玩了）
Were I you，I would go and play （if省略，were提前，还是虚拟语气 ）
if I had followed your advice，I would have been in a better position。（如果我听从了你的建议，我已经获得了一个好的职务）
Had I followed your advice,I would have been in a better position.(if省略，had提前，倒装，仍是虚拟语气)
原文：https://www.cnblogs.com/lhjzxy/p/11707481.html