The example: There were no cars on(during) Tutankhamon's time.
Is the word "on" used correctly in the example above? If not, why?
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No. We generally only use on for time to refer to days.
I'm going to the mall on Friday.
You don't make a fuss of me like that on my birthday.
To refer to smaller units of time, we might use at for a specific point in time:
I'll get home at three o'clock.
Or during for periods of time:
I'll be working during the afternoon.
And for longer periods of time, it would be in:
There were no cars in Tutankhamun's time.
In 2100, will we still travel for work?
Though you can still use during for longer periods of time as well.