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I'm not sure if (subject + verb)
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'I'm not sure' expresses a feeling of uncertainty or lack of confidence on a particular matter.
Here are some examples:
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I am not sure if they will offer me the job.
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I'm not sure if she'll return my call.
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I'm not sure if my wife will understand.
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I'm not sure if we will go out tonight.
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I'm not sure if I understand your question.
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I am not sure if I can handle it.
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I am not sure if it will happen.
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I am not sure if it will matter.
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I am not sure if my mom will notice.
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I am not sure if they will permit us to park there.
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