i know whether vs i know if

Both "I know whether" and "I know if" are correct phrases, but they are used in different contexts. "I know whether" is used when there are two or more options or possibilities, while "I know if" is used when there is a yes/no question or a simple condition.

Last updated: March 17, 2024

i know whether

This phrase is correct and commonly used in English when there are two or more options or possibilities.

Use "I know whether" when you are referring to a situation where there are multiple options or possibilities, and you are aware of which one is true.

Examples:

I know whether he will come to the party or not.
Do you know whether it will rain tomorrow?
She wants to know whether you prefer tea or coffee.
We need to find out whether the store is open today.
I don't know whether I should take the job offer.

Alternatives:

I am aware of whether
I can determine whether
I can tell whether
I can find out whether
I can ascertain whether

i know if

This phrase is correct and commonly used in English when referring to a yes/no question or a simple condition.

Use "I know if" when you are talking about a situation where there is a yes/no question or a simple condition, and you are aware of the answer or outcome.

Examples:

I know if she is coming to the meeting.
Do you know if the train is delayed?
He wants to know if you have finished the report.
I don't know if I can make it to the party.
She asked if you were going to the concert.

Alternatives:

I am aware of whether
I can determine whether
I can tell whether
I can find out whether
I can ascertain whether

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i know whether vs i know if

i know whether

i know if

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