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The phrase "is if" is not correct in written English.
Instead, you would use "if" on its own, or "whether or not" depending on the context. For example: I am not sure if I want to attend the party. or I am not sure whether or not I want to attend the party.
Dictionary
is if
noun
An uncertainty, possibility, condition, doubt etc.
Exact(59)
The crucial word is "if".
"It is, if he's president.
That is, if he wants to.
The story is, if anything, more impenetrable.
That is, if it starts at all.
That is, if the weather cooperates.
That is, if the gambit is successful.
That is, if Congress goes along.
This is If I Had a Tail.
That is, if Congress lets it through.
Similar(1)
Perhaps the most famous is if-thenism.
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