at once /at that time /right now/just now如果在直接引语中要变间接引语~有什么变化?如题

问题描述:

at once /at that time /right now/just now如果在直接引语中要变间接引语~有什么变化?
如题

at once /at that time 不变;right now/just now改为right then/just then