Definition: used at the beginning of a relative clause to show what thing is being referred to Level: A2
这是我昨天找到的那把钥匙。
This is the key ___which I found yesterday.
这些是我们都知道的问题。
These are problems ___which we all know about.
你知道那家小意大利餐厅吗？就是我信里提到的那家。
You know that little Italian restaurant - the one ___which I mentioned in my letter?
