英语语法

Question

There are cases （）speech has started late in a child who eventually turns out to be of high IQ.(WHERE)
I'd like to find a job (where) i can combine my qualificatian with my interest .为什么不是which
we have to consider what to do in situations (where) there are many people .
Those successful deaf dancers think that dancing is an activity (where) sight matters more than hearing.
全部都选where的理由是什么，要详细~

Answer 1

There are cases （）speech has started late in a child who eventually turns out to be of high IQ.(WHERE)
in these cases cases 是先行词

I'd like to find a job (where) i can combine my qualificatian with my interest .
in the job job是先行词

we have to consider what to do in situations (where) there are many people .
in the situation situation是先行词

Those successful deaf dancers think that dancing is an activity .
sight matters more than hearing in this activity. 分解成两个单句就可以看出连接词还可以用in which（除了where以外），activity是先行词

前几个句子都可以分解成两个单句，像最后那个句子那样，这时你就会看明白的，如果实在搞不懂，不妨死记硬背，这些情况下必须用where或in which

Answer 2

因为后面的从句都不缺主谓宾，那就只能用where来做一个同位语从句的连词。

Answer 3

where是在哪里的意思而which是哪一个的意思，
这些情况下必须用where或in which