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Persian Learner Posted 10 years ago
Grammar

All correct?

Hi.

I don't know that whether it is correct.

I don't know whether it is correct.

I don't know if it is correct.

Are all of the above sentences correct and natural?
  

Top answer

Persian Learner Are all of the above sentences correct and natural? No. You can't use a combination of "that whether" as in your first sentence.

— CalifJim

  • Persian Learner Are all of the above sentences correct and natural?
  • No.
  • You can't use a combination of "that whether" as in your first sentence.
  • The other two are OK.
  • CJ
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1 Answers
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Persian LearnerAre all of the above sentences correct and natural?
No. You can't use a combination of "that whether" as in your first sentence. The other two are OK.

CJ
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