stage 作先行词定语从句都用where来引导么有用when的么?

stage名词 n。[C]1。舞台Some girls are dancing on the stage。一些女孩在舞台上跳舞。2。注意中心,活动舞台,场所3。(进展的)阶段;时期A caterpillar must pass through the cocoon stage to become a butterfly。表示这些意思时,可做先行词。例句：1。表地点The stage where the girls are going to dance is in the gym。2。表时期The stage when he is preparing for his study is relly important。希望那个你能明白!