past the time 點解?

You stay out in the evening past the time you are supposed to be home
= You stay out in the evening later than the time you are supposed to be home

“past” is used as a preposition in the above sentence.

Past (preposition) = later than (晚於)

If it is past a particular time, it is later than that time.
It was past midnight...
It's past your bedtime.

Hope that can help.

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「逾時」，全句係話你做乜成晚唔見咗人，你應該返咗屋企噃﹗