题目内容：

They must go home now. 变成一般疑问句、特殊疑问句、否定句

优质解答

Must they go home now?
What must they do now?
They needn't go home now.（一般用needn't否定,表示他们现在不必回家.而mustn't 则表示他们不许回家,意思完全不一样.）

追问：

用when开头的特殊疑问句？

追答：

When must they go home?