it is not certain if vs it is not certain whether

Both phrases are correct and commonly used in English. They are interchangeable and can be used to express uncertainty about a situation or outcome.

Last updated: March 30, 2024 • 3648 views

This phrase is correct and commonly used in English.

"it is not certain if"

This phrase is used to express uncertainty about a situation or outcome.

Show examples from the web [+]

If you are also being treated for Human Immunodeficiency Virus (HIV) infection (AIDS) with zidovudine or stavudine, it is not certain if ribavirin will change the way these medicines work.
If you are also being treated for Human Immunodeficiency Virus (HIV) infection (AIDS) w ith zidovudine or stavudine, it is not certain if Rebetol will change the way these medicines work.
By the same token, it is not yet certain that, if the Commission did prepare a legislative initiative, it would take the form of a regulation, as suggested by the House.
Death is not certain if your actions in life performed with kindness
I'm not certain if you got my last...
I'm not certain if he should be praised or condemned.
I am not certain if they primarily serve Europe's interests.
These injections are justified even if it is not certain that you have hypoglycaemia.
It's not certain if I'll come back or not.
I'm not certain if you are aware, but Agent Booth and I are getting married today.
At this time, we are not certain if this new information will change the direction of the investigation.
Even now, I'm not certain if I've done the right thing in allowing M to live.
It is not certain that problems will arise but if they do the Commission will have to find a way of better coordinating different programmes.
The situation there is extremely tense, and it is not certain whether these elections will be held under proper conditions, if, that is, they are held at all.
First, it is not certain that all power plants without PPAs generate 'dirty' electricity.
It is not certain either that systematically comprehensive descriptions provide real value added.
It is not certain that the criteria should be exactly the same for the various substances.
You're still not certain if any of the Wraith on the planet survived?
I'm not certain if you got my last... Well, why wouldn't you have gotten
However, I am not certain if in assuming the role of leader in the international fight against global climate warming, as is recommended in the document, the EU is not trying to take on too much responsibility for global affairs.

Alternatives:

it is not certain whether

This phrase is correct and commonly used in English.

"it is not certain whether"

This phrase is used to express uncertainty about a situation or outcome.

Show examples from the web [+]

However it is not certain whether this is caused by Ziagen, other medications you may be taking or your HIV infection.
At the time the deposit is placed, it is not certain whether or not the premium will be paid.
The situation there is extremely tense, and it is not certain whether these elections will be held under proper conditions, if, that is, they are held at all.
Since European eel are found in the Black Sea and in river systems connected to it in low numbers, it is not certain whether or not those waters constitute a natural habitat for that species.
if it is not certain whether the contract is to be a fixed-term contract, subparagraph (b) shall be used.
It is not certain whether the Council will reach an agreement before the end of the year on the recasting of the VAT Directive, and particularly on the application of a reduced rate for labour-intensive services.
It is not certain whether it will be possible for the influx of sand to keep pace with the additional subsidence caused by gas extraction.

Alternatives:

it is not certain if

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it is not certain if vs it is not certain whether