I am not sure _____ he will come here oI am not sure _____ he will come here or not.答案给的是whether和if都可以,请问为什么if也可以呢?

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• I am not sure _____ he will come here oI am not sure _____ he will come here or not.答案给的是whether和if都可以,请问为什么if也可以呢?
• I'm sure he will come tomorrow.的同义句：He is____ ____ ____tomorro.要用到sure
• I am sure you all will be (r) when you come back from the holiday