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Most of the time when I am speaking, I forget to use "whether", and when I reach the end of my sentence I find that I had to apply it in my sentence then I correct my sentence with the addition of "whether".

For example, consider this sentence: "I don't know I can say it to you" when I reach to the end of the sentence I find that I have to use "or not" at the end of my sentence (... it to you or not), therefore I had to apply "whether" (I don't know whether I).

1- I want to know from the grammatical point, this slipping up is correct?
2- Do the native persons fall in difficulty to understand my mean?

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    Can you give an example of what you mean? "Whether" can be used in several ways.
    – TypeIA
    Commented Mar 2, 2020 at 11:54
  • @TypeIA I added an example
    – lee
    Commented Mar 2, 2020 at 12:06

1 Answer 1

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"I dont know I can say it to you" is ungrammatical to begin with. It should already contain "whether" or "if." This requirement doesn't arise from adding "... or not" to the end. The following are all correct. (In each case I've replaced "say it to you" with "tell you," which is more idiomatic.)

  • I don't know if I can tell you.
  • I don't know if I can tell you or not.
  • I don't know whether I can tell you or not.
  • I don't know whether or not I can tell you.

In all cases, you need "if" or "whether" when referring to conditional knowledge of a true-or-false fact.

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