He said, "He will go to Beijing tomorrow." （直接引语）
He said that he would go to Beijing the next day.
He said: "The sun rises in the east."
He said that the sun rises in the east.
now→then, last month→the month before.
today→ that day, three days ago→three days before.
tonight→that night, tomorrow→the next day.
yesterday→the day before, the day after tomorrow→in two days.
this→that these→those here→there
He said, "My sister was here three days ago."→
He said that his sister had been there three days before.
Mother asked me, "Did you buy any meat for lunch?"→
Mother asked me if/whether I had bought some meat for lunch.
"What do you do?" he asked me.
He asked me what I did.
"Do you like English or Chinese?" He asked me.
He asked me whether I liked English or Chinese.