……感觉你打错了
呃 主句和从句要前后一致 主句是过去时从句也要是过去的某个时态
例如：He said that he had finished his homework.前面是"said",后面就不能用"has"而只能用"had".
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不同就在于：
1改后是：He said that she wanted to see her son soon.
2改后是：He says that she wants to see her son soon.
没有什么大的不同,时态不同罢了.