又
yòu
又 looks backward: the same footprint, pressed twice
The picture The same footprint pressed down a second time on ground you've already walked.
Where the picture shows up in 又
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that footprint again
你怎么又迟到了？
nǐ zěn me yòu chí dào le
How are you late again?
Use 又 for what already happened, 再 for what hasn't. Say 明天再来, not 明天又来.
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today on top of yesterday
昨天下雨，今天又下雨。
zuó tiān xià yǔ, jīn tiān yòu xià yǔ
It rained yesterday, and it's raining again today.
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the same slip once more
我又忘了带钥匙。
wǒ yòu wàng le dài yào shi
I forgot my keys again.
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the cycle comes back around
明天又是星期一了。
míng tiān yòu shì xīng qī yī le
Tomorrow is Monday again.
For a cycle that is already fixed, 又 is used even about the future.