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Discover Ludwig"this must be it" is a perfectly correct and usable phrase in written English.
You can use this phrase when you feel that something or some situation is likely the answer to whatever you have been seeking or looking for. For example: "I've been searching for the answer to this problem all day, but I think this must be it!".
Exact(18)
Oh, this must be it.
"This must be it," Shea said.
"This must be it," whispered Susan.
Every village they reached, they thought: "This must be it – they're dropping like flies here".
If ever there was a bad political time to privatise the lot, this must be it.
If a picture is worth a thousand words, then surely this must be it.
Similar(42)
"I did triage: this must be in it, this should be in it if we have the time, and we might be able to get rid of that".
This must be how it was.
This must be what it's like to have kids.
This must be what it feels like to be Harvey Weinstein attending a test screening.
This must be what it is like to die, which the Don does soon afterward.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com