“It could be”の意味は?

名探偵シャーロック・ホームズを現代のイギリスに蘇らせたBBCのテレビドラマ『Sherlock』を観ながら、ETC英会話のトニー先生のレッスンを受けています。

今日はこんなダイアログから。

MAN(M):　Do you plan to continue your association with Sherlock Holmes?
JOHN:　I could be wrong, but I think that’s none of your business.
MAN(M):　It could be.

さて、“It could be”とはどのような意味なのでしょうか。

“It could be” in this situation, when he says “I think that’s none of your business”, and the man says “it could be”, means actually if you knew what I know or actually “might be my business”.

The difference between “could” and “might” is usually, “could” is the same as “might”.
You can use both exactly the same.
But “could” is more “might”, if the situation is different.
So this “might be” mine if something happens.
So one example I was doing for that, “might” is just possibility.
“Could” is possibility if situation is different.
OK, I am cooking tonight.
Is dinner going to be delicious?
We, it could be if I got right ingredients.
So I am a good cook, but if it is going to be really nice, I need the right ingredients.
So if I got them, it will be nice.
If I am not a very good cook, and I have all the ingredients, and you said “is food going to be delicious?”.
And them, my reply might be “oh, might be”.
We don’t know.
Because I am not a very good cook.

That’s none of your business.
それはあなたには関係のない事です。

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