それはそうとanyway; that aside
You drop the subject on purpose to bring up something else: "anyway", "that aside". It is a little more deliberate than ところで.
I'll hear all about the trip later. Anyway, isn't it about time for the train?
How to form it
One subject。 それはそうと、+ another
It opens a new sentence, often after a short answer: うん。それはそうと….
- After it
- Mostly a question, or something practical: a time, a deadline, a thing you meant to ask.
- How it sounds
- Purposeful, not rude. Cutting across something the other person cares about, it can sound as if you weren't listening.
- Where you'll meet it
- Conversation, polite or casual, and dialogue in novels. Rare in other writing.
In use
The last scene of yesterday's movie was good, wasn't it?
Yeah. Anyway, have you handed in today's homework yet?
The food at the new place was good, wasn't it? Anyway, I wonder if there's still a bus home.
Let's go over the details of the plan this afternoon. That aside, have you contacted the other party yet?
Polite, at work.
Close neighbours
ところでN3
The plain "by the way": a different subject, with nothing needed to link it to the last.
I heard Tanaka is being transferred to Osaka next month. By the way, what time does today's meeting start?
そういえばN2
"That reminds me": something just said or noticed brings the new thing to mind.
I heard Tanaka is being transferred to Osaka next month. That reminds me, when shall we have the farewell party?
ちなみにN2
"Incidentally": a side fact about the same subject, one you could leave out.
Ms. Tanaka is from Hokkaido. She went to college in Sapporo too, by the way.
それはさておきN2
The same move in a talk or in writing, often back to the main business after a digression.
Anyway, let's settle next week's schedule.
Check yourself
1What is B doing?
A
Choose an answer to see why.
2B turns from the game to work. Which one fits B's reply?
A
Choose an answer to see why.
More detail
話は変わるけど
People also announce the change outright: "to change the subject". Politely it is 話は変わりますが.
To change the subject, are you free next Sunday?
それはそうだけど
It sounds alike and is something else: "that's true, but…". You agree, then argue.
That's true, but it's still too expensive.
More sentences
Let's talk about that problem later. Anyway, are you feeling all right now?
You can sort out the photos over the weekend. Anyway, do you have your key?
Let's leave the new office for another time. Anyway, what time does tomorrow's meeting start?