一定是要为天皇陛下
“You must be on some important business”
THE DIALOGUE REEL
特使如此来去匆匆
“The Special Envoy is in such a hurry.”
一定是要 为 天皇陛下
“You must be on some important business”
“You must be handling top-secret business from the very top; can you tell me what it is?”
Invoking the highest authority figure validates the listener's importance while disguising an inquiry as respectful praise.
LEARNING CHUNKS & PARTICLES
must definitely be
Use this collocation when making a strong, confident deduction based on context.
for / on behalf of...
A formal preposition introducing the person or entity being served or represented.