The phrase "are even certain" is correct and usable in written English.
It can be used to emphasize the existence of specific instances or examples that are definite or assured.
Example: "There are even certain cases where the rules do not apply."
Alternatives: "there are indeed specific" or "there are actually particular".
"It's easy to get offers of commercial kidney organs on the internet, there are even certain groups of kidney donor brokers on social media," Tony told the ABC.
In fact we are so sensitive to our history of racial victimization, there are even certain words that may not be said by people of one color but may be said by people of another: in other words, we are so aware of the racial issue that we've almost changed the tacit rules of our language on its account.
If God can be perceived by the brain (there are even certain areas of God), does this not mean that God is only in the brain.
As of Tuesday night, before it was even certain that Mr. Bush would become president, his skeletal transition operation here had received 20,177 job applications.
Europe is at least a decade behind the United States in exploring its shale resources, and no one is even certain how much oil and gas there is, much less how much can be recovered profitably.
I don't think my father was even certain about my birthday until about 10 years ago.
Nobody is even certain how the senator actually feels about the issue, though it is assumed Murkowski believes herself to be especially patriotic, and that she loves Jesus very, very much.
If these rules are not complicated enough, matters are even trickier in certain condominiums.
There exists forums and support groups, some of which are even particular to certain cults.
There exist forums and support groups, some of which are even particular to certain cults.
