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The phrase "is that which" is correct and usable in written English.
You can use this phrase to introduce an explanation which clarifies or further defines a concept that has been previously mentioned. For example, "Happiness is that which we all strive for in life."
Exact(60)
And then there is that which cannot be measured.
"Invasion!" is that which has been clamored for.
The mentality at the pound is, "That which doesn't kill dogs makes us stronger".
It is that which draws you on".
A miracle is that which creates faith.
The only avenue open is that which petitioner actually took.
It is that which thou hast often seen.
There is none; the moon is that which suffers eclipse.
The best government is that which governs least.
Entertainment is that which you receive without effort.
And it is that which is strangely disturbing.
More suggestions(17)
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delivers that which
demonstrates that which
explains that which
constitutes that which
enables that which
exactly that which
information that which
is precisely to
is those persons who
was simply
is the following which
is exactly what
is the man who
is those individuals who
are the people who
Write better and faster with AI suggestions while staying true to your unique style.
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