でしょう・
でしょう and だろう can ask the listener to confirm a fact or agree with a judgment that the speaker expects both people can recognize. In English, this often corresponds to “right?” or “isn't it?”
The speaker expects a particular answer
Use this ending when the listener has a reason to know the fact, or when both people can directly notice the same thing. You are not asking from a completely neutral position: you expect confirmation or agreement.
Confirming a shared fact
Both speakers have access to the meeting schedule, so A is checking an expected fact rather than making a prediction.
Listen for the spoken melody
In speech, a short rise or another clearly listener-directed final melody often helps show that confirmation is wanted. A question mark is useful in writing, but context and tone—not punctuation alone—separate this use from a probability judgment.
Confirmation versus prediction
The form itself is identical. With a listener who can confirm the information and a checking tone, it means “right?” Without that listener-directed setting, it can instead express what the speaker thinks will probably happen.
明日は雨でしょう。
It will probably rain tomorrow.
AnalyzeWith no reason to ask the listener for confirmation and with a falling statement melody, this is a prediction.
More examples
昨日の店、安かったでしょう？
That restaurant yesterday was inexpensive, wasn't it?
AnalyzeSaid to someone who went to the restaurant with the speaker.
この席からよく見えるでしょう？
You can see well from this seat, can't you?
AnalyzeThe listener is sitting there and can confirm the view directly.
会議は三時に終わったでしょう？
The meeting ended at three, right?
AnalyzeThe speaker expects the listener to know because the listener attended.
鍵は受付に返しただろう？
You returned the key to reception, right?
AnalyzeThe speaker expects that this was done; depending on tone, the question can sound demanding.