when I said,I’ll never let you go当我说我将永不放开你的手老师说间接引语主过从过为什么不是I would never let you go

因为有了逗号.这就相当于iwill什么的是当时说话的语境.所以应该用过去你说这句话时话里用的时态.不然的话.另一种表达就是.when I said Iwould never let you 在比如.she said ,she is a teacher .she said she was a...意会吧。多读读。找语感