Question

why he must leave now还是why must he leave now

Answer 1

Why must he leave now?

如为特殊疑问句,应为：Why must he leave now?

特殊疑问句结构：特殊疑问词＋一般疑问句?

如为从句,应为：why he must leave now.

从句的句式为陈述句句式.