1.in which和where区别?

1.你指的应该是在定语从句中,in which和where的区别吧?
1）两者有时候可以互换,如：
This is the city in which I lived last year.
= This is the city where I lived last year.
其中：lived in which = lived where = lived in the city.
2）但是如果定语从句中谓语动词之后的介词不是用in的话,则只能用where,而不能用in which.
如：This is the farm on which I worked last year.
= This is the farm where I worked last year.
之所以用on which而不用in which,是因为on the farm是固定短语,而不是in the farm.
2.复数：have.
如果用with连接主语,则该句谓语动词的数采用就远原则,即和with前面的主语保持一致.
所以该题的主语为both the father and the mother,是复数,所以动词也用复数形式have.

in which和where可以互用
have

1.where就是在哪，in which就是在哪一个里，中文看起来很相似，其实英文也差不太多，不过in which由于有介词in的使用，跟where的使用情况就不大一样了。
2.主语是both ×××所以应该是复数。