间接引语中,说话内容中从句的时态应怎样变化?

对。
首先，间接引语要做到时态的一致，即从句与主句时态一致
然后，如果从句是客观真理，就不要该时态了，例如practise make prefect
the moon run around the earth

貌似是 1.主过从过 2.主句 现在时。， 从句任何时（除 过去完成。过去将来）
3.从句为客观真理或者自然现象 都为一般现在时

是对的。
时态变化：
1）一般现在是变成一般过去时
He said:"this book is yours."
He said that that book was mine.

2)一般进行时变为过去进行时
She said:"the children are reading text."
She said that the children were reading text.

3)现在完成时变为过去完成时
He said:"I have finished my homework."
He said he had finished his homework."

4)一般将来时变为过去将来时
He said:"I will wait for you."
He said he would wait for me.

5)一般过去时变为过去完成时
She said:"I returned book to the library."
She said she has returned book to the library."

He told the young man to stand where he was.

直接引语与间接引语的转化
直接引语和间接引语在句中都作宾语。一字不漏地引述别人的话叫直接引语;用自己的话转述别人的话叫间接引语。直接引语变为间接引语应注意以下问题:
（1）间接