The phrase "that how" is not grammatically correct in written English.
To use this phrase in the correct way, you would need to change the words to "this way". For example: "I want to show you this way how to do it".
Exact(60)
Is that how you met?
Is that how it is?
Isn't that how it's done?
Is that how it was?
Is that how the magazine is edited?
Was that how it could have happened?
Is that how "Mad Men" operates?
"How about that?" How about it.
Is that how we value our health?
Is that how Ay saw himself?
Is that how Bhatti feels?
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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