She said: “He will be busy.”→ She said that he would be busy.

问题描述:

She said: “He will be busy.”→ She said that he would be busy.
为什么will 要改成would?意思不是 她说,他没有时间的意思吗?那为什么改成间接引语will要变成would?

will 的过去式是would ,改成would为了与时态相一致(过去said)就是说变成间接引语的时候原本引号里的也要改成与引号外的时态一样吗?是滴