“I don’t know” and “I do not know”, both have the same meaning.
People normally use “I don’t know” to make it easy/short in their daily conversation. “I do not know” will be used more in written communication like writing formal emails. So there is no difference in their meaning.
“I don’t know” and “I do not know”, both have the same meaning.
People normally use “I don’t know” to make it easy/short in their daily conversation. “I do not know” will be used more in written communication like writing formal emails. So there is no difference in their meaning.
Both are correct in use. “Don’t” is just a contraction for “Do not”.
Both are same but in pronouncing I don’t know sounds better