Manhattan Sentence Correction上不懂的问题

echowjx

5.7

Manhattan p26

Example3

Actual :  If Chris and Jad met, they DISCUSSEDmathematics.

Hypothetical:  If Chris and Jad met, they WOULD DISCUSSmathematics.

下面是这样解释的

Explanation: The firstsentence could be said by someone who is unsure whether Chris and Jad haveactually met: “If this did indeed happen, then that is the consequence.”   我不大明白mahattan的解释。

同学们可以给我翻译一下If Chris and Jad met, they DISCUSSED mathematics. 这个句子吗？这是虚拟语气还是怎么样？怎么感觉很奇怪？？？

Manhattan p31

Students at Carver High  School are encouraged to pursue only thoseextracurricular activities from which __stems success in collegeapplications.

画线部分可以换成 success in college applications stems

为什么两种说法都可以呢？？下面是manhattan的解释，但是我觉得没有说到点上。

Bothversions are correct! The original sentence inverts the normal order of subject{success)

andverb {stems = “originates”), but this inversion is possibleafter which or in similar positions. There is no change inmeaning.