就
jiù
就 says there is no gap between the two
The picture Two dots pushed flat against each other. Nothing has slipped in between: no waiting, no condition, no other option.
Where the picture shows up in 就
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no gap before arriving
我马上就到。
wǒ mǎshàng jiù dào
I will be there any second.
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a shorter gap than expected
他八点就来了。
tā bā diǎn jiù lái le
He was already here by eight.
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no gap between if and then
你去我就去。
nǐ qù wǒ jiù qù
If you go, I go.
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no room for another option
我就要这个。
wǒ jiù yào zhège
This is the one I want.
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no gap between learning and doing
学了两天就会了。
xué le liǎng tiān jiù huì le
Two days of practice and he has already got it.
At the same eight o'clock, 就 says already and 才 says not until. The clock is not the measure; the speaker's expectation is.