Tell me please if there is any difference in meaning in the following sentences.

The teacher told me that I would pass the test, but I don't know that I can.

The teacher told me that I would pass the test, but I don't know if I can.

  • Did you intend to emphasize the second occurrence of the word that in the first sentence? – laugh May 25 '19 at 12:50
  • Sorry, it was a mistake – Dmytro O'Hope May 25 '19 at 13:16
  • There isn't really any difference in meaning. Both sentences say that you are not sure whether or not you can pass the test. We tend to use that when we are talking about something that has been taken to be true in the background. It cold be something that the person you are speaking to has said, or something that you would normally expect to be true. For example, if you are buying something and the assistant says I'll check [that] we have it in stock, this implies he thinks they do have it in stock, whereas I'll check if we have it in stock wouldn't imply anything... – user96060 May 25 '19 at 13:46
  • in your sentence (by the way it should be my teacher told ME that... or my teacher said that...) you are saying that you don't know, so the reason for using that could only be to refer to the fact that it has been said... but since you've just said it yourself, this doesn't add or change anything, and the meaning is just the same as with if. – user96060 May 25 '19 at 13:49
  • I am sorry, but I am a bit confused. Doesn't it mean that some is unsure if they check it? Could you please eleborate on the explabation with the word "check" and "that". And by the way, your comment would make a good answer. – Dmytro O'Hope May 25 '19 at 14:19

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