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Hello!
Some of my students wrote "I play the guitar at 4'o clock in the evening' but my intention is "afternoon" I wrote Korean and they translated it into English. The correct answer is 4' o clock in the afternoon, but some wrote 4'o clock in the evening. SO, from native speaker's perspectives, 4p.m. can be "evening??"
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Evening begins generally when the sky gets dark around sunset.
It is also after normal working hours.
The earliest time I would call "evening" is 6 or 7 pm.

Word history:
evening (n.) from Old English æfnung "the coming of evening, sunset, time around sunset."
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I would not consider 4 pm to be "evening".
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Note that you should leave a space after the numeral and the ' goes here: o'clock.

4 pm
4 p.m.
4 PM
4 o'clock

Not 4'o clock

(Even in Maine, when it was dark at 3:30 in the afternoon in the winter, 4 was not yet "evening." It was still afternoon.)
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The correct answer would be 4 o'clock in the afternoon. In my opinion after 5 o'clock or 6 o'clock would be considered evening. It also depends on where you live. If the sun starts to go down at 4 o'clock, you could pass it off as evening. I'm not sure what it's like in Korea. Confirm with multiple sources before you take my words for granted.