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good morning - शुभ प्रभात (shubh prabhat) good night - शुभ रात्रि (shubh raatri) good afternoon and good evening = नमस्कार (namaskar)

I'm studying hindi. Thanks for the answer, it's useful for me!

good morning -shubh prabhat; good night -shubh raatri. We do not say good afternoon and good evening.