薄冰《高级英语语法》P535：that有时亦可用作表示时间的关系副词,相当于When.如：Ithappenedonthedaythatiwasborn那件事是在我出生的那一天发生的（that=when）注：that有时并不等于when,试比较

Question

薄冰《高级英语语法》P535：
that 有时亦可用作表示时间的关系副词,相当于When.如：
It happened on the day that i was born那件事是在我出生的那一天发生的（that=when）
注：that 有时并不等于when,试比较：
It happened the day when i was born（when i was born是定语从句,修饰the day)
It happened the day that i was born（the day that i was born应看作是状语从句,修饰谓语动词happened)
我比较不出来1和2.namely,i can not understand the two sentences in brackets.特别是2括号里的意思,我不太懂.

Answer 1

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