定语从句中关系代词that代替when的问题.

问题描述:

定语从句中关系代词that代替when的问题.
May 30 was the day that I spent looking after my brother.
May 30 was the day when I spent two hours looking after my brother.
请问为什么两句有所不同?

May 30 was the day that I spent looking after my brother.在这句话中是I spent the day (May 30),the day作为spent的宾语,所以用that指代.May 30 was the day when I spent two hours looking after my brother....