兩個句子問題(My treat跟You should ~~)

1.You should follow a good tour guide when (which)you take a trip to some place you have never been to.
(1)上面那是甚麼句啊?(adj.子句還是 N子句?)when (which)you take a trip to some place you have never been to.
(2)如果是adj.子句為什麼要有which啊?不是由when所引導嗎?
(3)為何可省略?which

2.My treat(我請客)
為何是用my?(我的請客?)
為何不適用I treat ?
Update: 還有分關係副詞跟關係代名詞喔?那是甚麼?
Update 2: 那個
既然which是關係代名詞
它可以省略?
Update 3: 形容詞子句 不是只有that可以省略嗎?
who, whom, that, which都可以省?
Update 4: 非限定用法裡,不可省

為何不可省啊?
Update 5: 所以who, whom, that, which都可以省?
還是指下面講的用法才可省?
Update 6: 我還以為只有that可以省呢!!
2 answers 2