Which is correct ?, If people will not sleep enough, they feel exhausted., If people do not sleep enough, they feel exhausted., Which is correct ?, If she arrives early tomorrow, we start the meeting on time., If she arrives early tomorrow, we will start the meeting on time., Which is correct ?, If you mix oil and water, they will not combine., If you mix oil and water, they do not combine., Which is correct ?, If students don’t attend lectures, they will understand less., If students don’t attend lectures, they understand less.

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