首先你的两个句子关系副词没用错。
请观察我写的二组句子:
1. This is the mountain village where I stayed last year.
(因为stay是不及物动词,从句是主谓结构,选择关系副词,即I stayed in the mountain village)
This is the mountain village which/ that/ 不填 I visited last year.
(因为visit是及物动词,后加宾语,先行词在从句中充当主宾或表,选择关系代词 ,即visit the mountain village)
2. I'll never forget the days when I worked together with you.
(因为work是不及物动词,不可说work the days, 只能说work during the days,所以选when)
I'll never forget the days which/ that/ 不填 I spent together with you.
(spend为及物动词,有spend time (in) doing sth. 的搭配,所以只能选关系代词)
即:从句如果主宾不齐,选关系代词(除whose), 如果主宾齐(含主谓结构),选关系副词加whose.
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