(1）If you were to have asked me, I would have been only too willing to help.

=If you had asked me, I would have been only too willing to help.

参考译文：如果你当时问我了，我会非常乐意帮助你。

(2)If you were to have explained your problem to me, I would have been able to help you.

=If you had explained your problem to me, I would have been able to help you.

参考译文：如果你当时把你的问题想我解释了，我也就能帮助你了。

(1)虚拟条件句基本形式表达结构（对过去事件虚拟和假设）

if sb had done sth,sb could/might/would have done

(2)虚拟条件句变体形式表达结构（对过去事件虚拟和假设）

if sb be to have done, sb could/might/would have done

第2种属于第1种变体形式

If we had caught the 10 train,we would have got there by lunch-time.

If we were to have caught the 10 train, we would have got there by lunch-time.

特别备注以下2点

(1)were to +动词原形，对将来的虚拟和假设

(2)were to have done ,是对过去的虚拟和假设（相当于是had done 的一种变体形式结构表达。）