when

The Queen"s last visit was in May,when she opened the new hospital.

女王上次來訪是在五月份,她那時主持了這座醫院的落成典禮.

How can they learn anything when they spend all their spare time watching television?

他們把所有的空閒時間都用來看電視了,還能學什麼東西呢?

It was the sort of morning when everything goes wrong.

那天上午就是那樣,事事不順心.

It was raining when we arrived.

我們到的時候正在下雨.

He was fond of drawing when he was a child.

他還是個孩子時就喜歡畫畫

while

I lived in a hostel while I was a student.

我求學期間住在青年招待所裡.

She worked in a bank for a while before studying law.

她學法律之前在銀行工作過一段時間.

While Mary was writing a letter,the children were playing outside.

瑪麗寫信時,孩子們在外面玩耍.

I haven"t seen him for a long while.

我已經很久沒見到他了.

Turn off the switch while anything goes wrong with the machine.

如果機器出故障,就把開關關掉.