-When will he be back? - ______.
举一反三
- -When will he be back? - ______.
- ---Do you know when he will come back tomorrow. ---Sorry. I don t know. When he back I tell you.
- He went back four days ago. （when）
- When he finished the story, he pulled back his _____ and revealed the scar on his arm.
- ---When did he leave the classroom? --- He left ___ you turned back to write on the blackboard.