which和when在引导定语从句时的区别istillrememberthehappytimewhenilivedinthesmalltown.istillrememberthehappytimewhich/thatwespenttogethe我上面的句子对吗?还有什么时候用的是which,什么时候用when

　　which和when在引导定语从句时的区别

　　istillrememberthehappytimewhenilivedinthesmalltown.

　　istillrememberthehappytimewhich/thatwespenttogethe

　　我上面的句子对吗?还有什么时候用的是which,什么时候用when