when在句中的意思,及所起的语法作用.

when在这个句子是连词，引导一个时间状语从句，修饰 “Saturdays and Sundays ”
第一种ad.（形容词）
1. (用作疑问副词)什么时候,何时
I'd like to know when they'll let him out.
我想知道他们什么时候放他。
When did you last see Margaret?
你上一次见到玛格丽特是什么时候?
There were times when I didn't know what to do.
有些时候我不知道该怎么办才好。
第二种adv.（副词）
1. [疑问副词]什么时候, 何时
2. [关系副词]当...时
I still remember the night when Nanjing was liberated.
我还记得南京解放那天晚上的情景。
When will he come?
他什么时候来?
It was a time when motorcars were rare.
那是汽车很罕见的时代。
conj.
1. 当...时
How can he get the promotion when his boss dislikes him?
既然上司不喜欢他,那他怎么会获得提升呢?
I had only fifteen dollars on me when the book I wanted cost twenty.
我身上只带了十五元钱,可是我想买的那本书定价二十元。
Don't get excited when you talk.
你说话时别激动。
John got engaged to her when travelling last winter.
去年冬天旅行时,约翰与她订了婚。
n.
1. (事件发生的)时间[the S]
pron.
1. &ad. 什么时候
Since when has she taught her