“Now I'm going write down these sentences on the blackboard”said the teacher 怎么改成间接引语RT

“Now I'm going write down these sentences on the blackboard”said the teacher 怎么改成间接引语RT
“Now I'm going write down these sentences on the blackboard”said the teacher 怎么改成间接引语
RT

“Now I'm going write down these sentences on the blackboard”said the teacher 怎么改成间接引语RT
The teacher said(that)she/he was going write down those sentences on the blackboard then.

The teacher said that he（or she）would write down these sentences on the blackboard.