when定語從句例句：

1.I still remember the date when I joined the army.

2.Do you remember the day when you first came to the school?
3.The time when we got together finally came.

where定語從句例句：

1.I still remenbered the homeland , where I wsa born.

2.Please lend me your book, where I wrote your name.

3.My father and me ofen go that park ,where there is a tower.

4.People are afaid when they see a house where a person died.

5.Tell me the place where the accident happened yesterday.

when where可以非限定定語從句即非限制性定語從句，具體內容如下。

非限定性定語從句是英語語法中從句的一種，是定語從句的分支之一。作用是對所脩飾的成分作進一步說明，通常和主句間用逗號隔開，將從句拿掉後其他部分仍可成立。運用非限定性定語從句，尤其要注意其語法運用及其所表示的東西。非限制性定語從句是先行詞的附加說明，去掉了也不會影響主句的意思，它與主句之間通常用逗號分開，將非限定性定語從句放在句子中間，其前後都需要用逗號隔開。