Using "will" after when, where
Could you please explain to me why "will" is used in the sentence:

I'm not sure exactly when I'll get to Winnipeg.

Shouldn't it be "I'm not sure exactly when I get to Winnipeg"?

Thank you.

Question

Using "will" after when, where
Could you please explain to me why "will" is used in the sentence:

I'm not sure exactly when I'll get to Winnipeg.

Shouldn't it be "I'm not sure exactly when I get to Winnipeg"?

Thank you.

Answer

Hi Egor,
if the MAIN  verb in the sentence is PRESENT, like in your example (I'M NOT SURE), using WILL (FUTURE) after WHEN (in the subordinate clause) is perfectly correct. 
But in the following example you have to use the PRESENT  after WHEN:
"I WILL be happy WHEN  she ARRIVES".  I mean, when the MAIN  verb in the sentence is FUTURE, you use the PRESENT after WHEN (in the subordinate clause).

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