如何理解先行词为case ,situation ,point等的定语从句,引导词用where

题目

如何理解先行词为case ,situation ,point等的定语从句,引导词用where
如:We will discuss a number of cases ( ) beginners of English fail to use the language preperly.
A.which B.as C.why D.where
2.He was driving so fast as to get himself into a dangerous situation ( )he is likely to lose the control over his car.
A.which B.as C.why D.where
两道题都选where ,但是case,situation都不是地点,如何理解要选用where?thanks!

答案

where在此引导定语从句,修饰先行词cases,where的意思相当于in which
第二道题同样也是如此
in the case ,in the situation在..情况下