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The phrase "are only certain" is correct and usable in written English.
It can be used when specifying that only specific items or instances are being referred to, often in a context of limitation or exclusivity.
Example: "In this study, we found that there are only certain factors that significantly influence the outcome."
Alternatives: "only specific" or "just particular".
Exact(45)
But when you're a public health official, there are only certain things that you can do.
Like when you're a regulator, there are only certain things that you can do.
"There are only certain environments that are conducive to the origin of life," he says.
There are only certain moments in life that matter, she told me.
So there are only certain moments in history when great change can take place.
They are only certain that, unlike Lord Salisbury, they had better do something.
Similar(15)
She shakes her head: "I was only certain that she had to be a woman".
She is only certain that she won't vote for a Republican.
C It seems to be only certain muscles… P In my case, yes.
Consequently there will be only certain types of pupils they want to go there too.
In fact, it was only certain popular brands of milk powder that were selling out.
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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