应是有要事相告
“He must have something important to say.”
THE DIALOGUE REEL
入夜他亲自前来
“He came in person so late.”
应是 有要事相告
“He must have something important to say.”
那是你们的事
“That's your business.”
Direct spoken expression in this communicative setting.
Historical dramas frequently blend classical grammar elements like '相告' (mutually/directionally inform) to convey gravitas and dignity in speech.
LEARNING CHUNKS & PARTICLES
ought to be; likely is
A formal, written or classical-leaning deduction marker similar to 'probably is'.
to communicate important matters
A concise four-character construction common in formal registers for imparting significant intelligence.