On this visual you see two different functions of the word 在…

On this visual you see two different functions of the word /zài/

1) it means TO BE SOMEWHERE (of course it can be used just as a preposition)

2) it is a short version of 现在 /xiànzài/ NOW

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Also notice the sound similarity of words /hái/ 还 STILL and /hǎi/ 海 THE SEA (part of SHANGHAI)