1.本课课程的核心句是I'll leave tomorrow. What didi he say? He said that he would leave tomorrow. What did he tell you? He told me that he would leave tomorrow.
2.本课的核心句是I can't do this Maths problem. What did he say? He said that he couldn't do this Maths problem. What did he tell you? He told me that he couldn't do this Maths problem.
3.本课的核心句是I may return at six o'clock. What did she say? She said that she might return at six o'clock. What did she tell you? She told me that she might return at six o'clock.