I never forget the time when i won the first prize.另一种表达方式
是when sb啊,when doing sth是做某事时,when to do 是何时做某事
我只知道独立主格结构,由于与主语是同一个人,所以省略主语和助动词,构成进行时态的独立主格结构,比如刚才的句子:When (you are) leaving, just remind of me to see you off.(这里用进行时态表将来)