如果某人过去做了某事(坏事)，那么他永远不可能做某事
If Hugh Miller, after toiling all day in quarry (采石场), had devoted his evenings to rest and recreation, he would never have become a famous geologist.
雅思写作虚拟语气2.Sb would never have done sth(好事1) , never have done sth (好事2), if sb had done sth (坏事)
某人永远不可能做某事， 永远不可能做某事， 如果某人过去做了某件坏事
The celebrated mathematician, Edmund Stone, would never have published a mathematical dictionary, never have found the key to science of mathematics, if he had given his spare moments to idleness.
雅思写作虚拟语气3.Had sb done sth(坏事) ， sb would never have done sth (好事)
如果某人过去做了某件坏事，而不是去做某件好事，那么他永远不可能做某事(好事)
Had the little Scotch lad, Ferguson, allowed the busy brain to go to sleep while he tended sheep on the hillside, instead of calculating the position of the stars by a string of beads, he would never have become a famous astronomer.
对以上几个雅思写作虚拟语气的应用范文
Group discussion Google
If Google had ignored the importance of group discussion, this high-tech company would never have achieved today's stunning success.
(If sb had done sth, he would never have done sth)
Google, a once obscure, ailing / fragile company, would never have achieved today's stunning success, never have conquered so big a market share, if it had ignored the importance of group discussion.
(sb would never have done sth , never have done sth , if sb had done sth)
Had Google , a once small , obscure company , ignored the importance of group discussion ，the hi-tech tycoon would never , never have harvested today's overwhelming success . (压倒性的成功)