नाही(nAhI) and नको (nako) are two words used in Marathi in negative sentences. In English, equivalent to both of these is “No”/”Not”. It confuses learner which is used when. But careful observation of previous grammar lessons will show that नको (nako) is used only in particular cases and in all remaining sentences it is नाही(nAhI)

नको is used in negative forms of imperative sentences i.e. requests, suggestions, advice, or commands.

Commands / Imperative statements in Marathi
Using verb To Want/To Need
Using “Let” and “Shall we”

Negative Sentences – Present tense in Marathi
Negative Sentences – Past tense in Marathi
Negative Sentence – Future Tense in Marathi
Using “To Like” with other verbs
etc. and all other negative sentences