has he finished the work (用did you know联成一句话)

has he finished the work (用did you know联成一句话) "Did you know if he has\had finish his work?"一句中应是if he has还 he did not go home until he finished the work.为什么这里要用until?不 he has finished the work already 改为否定句 关于强调句,not until he finished the work,did he leave the office he did not know how to work out the probblems he finished the same work at the same time that i did 哪里错了 Have you finished the work? 英语纠错句子：Tim said he has finished the work last month.He said 连句we did not disturb(until) he finished the work he ( ) after he finished the work well. Has he finished the work yet?的yet能不用吗