学文网所谓含蓄虚拟条件句，是指将条件从句隐藏在上下文一定的短语中的一类条件句，其主要用法及表现形式可归纳如下：
1. 将条件隐含在不定式短语中
To hear him speak English，you would take him for a foreigner. 如果你听到他说英语，你会以为他是外国人。（=If you heard him speak English，you...)
To have studied harder， you would have passed the examination. 你学习更用功些，早就考及格了。（=If you had studied harder， you...）
2. 将条件隐含在分词短语中
Born in better times， he would have been a scholar. 如果出生在好时代，他早就成为学者了。（=If he had been born in better times， he would...）
Failing this time， what would you do？ 假若这次失败，那你怎么办？（=If you failed this time， what would...）
Walking alone in the dark， Mary would be terrified. 要一个人单独在黑暗中行走，玛丽会感到十分害怕。（=If Mary walked alone in the dark， she...）
3. 将条件隐含在介词短语中
But for your help we couldn’t have succeeded in the experiment. 如果没有你的帮助，我们的实验是不会成功的。（=If it hadn’t been for your help，we...）
In different circumstances， I would have said yes. 在其他的情况下，我就会同意了。（=If circumstances had been different， I would...）
4. 将条件隐含在名词短语中
Any person who had behaved in that way would have been dismissed. 任何人这样做了都会被开除。（=If any person should behave in that way...， he would...）
A few hours earlier， and you would have seen the famous writer. 要是你早来几个小时，你就见到这位著名的作家了。（=If you had come a few hours earlier， you...）
5. 将条件隐含在某些连词中
I didn’t know that he was a cheat， or else I wouldn’t have believed him. 我不知道他是个骗子，不然我也不会相信他了。（or else=if I had known he was a cheat）
I’m really very busy， otherwise I would certainly go there with you. 我真的是太忙了，不然我就会同你一道去了。（otherwise=if I were not so busy）
6. 将条件隐含在定语从句中
Anyone who had seen that painting might have taken it for a photo. 凡是看过那画的人，都可能把它看成是照片。（=If anyone had seen that painting...）
7. 将条件隐含在一定的上下文中
You might stay here forever. 你可以永远待在这儿。（=If you wanted to， you might...）
Don’t bother to read all these papers. It would take too long. 不要费事看所有这些文件了，那会花太多时间。（=...If you read all these papers， It would take too long）