直接引语变成间接引语时，从句时态无须改变的情况有哪些
直接引语变成间接引语时，从句时态无须改变的情况
He always says, “I am tired out.” ——>He always says that he is tired out.
2）当主句的谓语动词是将来时的时候，如：
He will say, “I'll try my best to help you.” ——>He will say that he will try his best to help me.
3）当直接引语部分带有具体的过去时间状语时，如：
He said, “I went to college in 1994.” ——>He told us that he went to college in 1994.
4）当直接引语中有以when, while引导的从句，表示过去的时间时，如：
He said，“When I was a child, I usually played football after school.” ——>
He said that when he was a child, he usually played football after school.
5）当直接引语是客观真理或自然现象时，如：
Our teacher said to us, “Light travels faster than sound.” ——>
Our teacher told us that light travels faster than sound.
6）当引语是谚语、格言时，如：
He said，“Practice makes perfect.” ——>He said that practice makes perfect.
7）当直接引语中有情态动词should, would, could, had better, would rather, might, must, ought to, used to, need时，如：
例如：
The doctor said, “You'd better drink plenty of water.” ——>
The doctor said I'd better drink plenty of water.
He said, “She must be a teacher.”——> He said that she must be a teacher.
He said, “She ought to have arrived her office by now.”——>
He said that she ought to have arrived her office by then.
The teacher said, “You needn't hand in your compositions today.”——>
The teacher said we needn't/didn't need to/didn't have to hand in our compositions.
She asked, “Must I take the medicine?”——> She asked if she had to take the medicine.
〔注〕：此处用had to代替must更好
Teacher: You may have the ball game this afternoon.
Student : What did the teacher say, Monitor?
Monitor: He said we might have the ball game this afternoon.