过
guo
过 is a stamp in your passport
The picture A stamp thumped into a passport. It proves you passed through once; it does not mean you are there now.
Where the picture shows up in 过
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a place you passed through
我去过上海。
wǒ qù guo Shànghǎi
I have been to Shanghai.
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a stamp from this morning
你吃过早饭了吗？
nǐ chī guo zǎofàn le ma
Have you had breakfast yet?
过 is not only for once-in-a-lifetime things. A stretch as short as this morning can carry a stamp.
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no stamp at all
这个药我以前没吃过。
zhège yào wǒ yǐqián méi chī guo
I have never taken this medicine before.
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one stamp, counted
我见过他一次。
wǒ jiàn guo tā yí cì
I have met him once.
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a stamp your ears kept
你听过这首歌吗？
nǐ tīng guo zhè shǒu gē ma
Have you heard this song?