04/07/2021
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I dont know is a sequence formed by the adverb "no" and a conjugation of verb "to know" (I dont know when will it come). I dont know is a sequence formed by the adverb "No" and the personal pronoun "se" (I dont know sell houses in this area). I dont know Y I dont know They are not valid words in Spanish, therefore, their use is incorrect.
The sequences "I don't know" and "I don't know" are written separately because they consist of two words. Therefore, it is wrong to write "nose" or "nosé" in one word.
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