首先句子成分是做定语还是状语,“当我有时间的时候”,做状语,是状语从句
如果when从句做定语,前面需要先行词
I remember the day when we played together.
play together on that day, on that day 是时间状语,当day作为先行词提前,用when来引导定语从句。
这个句子里when从句就是定语从句
I will visit my parents when I have time. when从句并不修饰父母,所以是状语从句