虚拟语气Wereitnotforyourhelp,Iwouldneverbeagoodteacher.看到别人的：虚拟式were也可以表示与过去事实相反的假设,如：IfIwerenotbusy,Iwouldhavecome.但是高中英语五三上只说了与过去事实相

Question

【虚拟语气】Were it not for your help,I would never be a good teacher.
看到别人的：虚拟式were也可以表示与过去事实相反的假设,如：
If I were not busy,I would have come.
但是高中英语五三上只说了与过去事实相反的是
主语+should/would/could/
might+have+过去分词
if+主语+had+过去分词
只有在与现在事实相反的才有
主语+should/would/could/
might+动词原形
if+主语+动词的过去式（be→were）

Answer 1

If I were not busy,I would have come.
这个句子明显是错误的 虚拟的时间混乱
您下面列举的虚拟形式都对.不仅五三上是那么说的,而且我见过的语法书上也是那么说的.