아직
ajik
Not 'no' — 'still on the way'
The picture A point marked on a moving timeline, and you haven't reached it yet. The line keeps rolling forward. 아직 stands on the near side of the mark; 벌써 has already gone past it. Same timeline, same mark — only which side of it you are on.
Where the picture shows up in 아직
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before the arrival point
아직 안 왔어요.
a-jik an wa-sseo-yo
He isn't here yet.
On the timeline, the other person's dot still sitting on the near side of the arrival mark.
안 왔어요 is bare fact; 아직 안 왔어요 carries the expectation that he will.
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before the ending point
아직 시간 있어요.
a-jik si-gan i-sseo-yo
There's still time.
The stretch of timeline still empty between here and the closing mark.
It works on the positive side too — it isn't only for negatives.
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before the point of being good at it
저는 아직 잘 못해요.
jeo-neun a-jik jal mo-tae-yo
I'm still not very good.
Your feet planted partway down the road to the fluent mark.
Unlike a flat 못해요, it implies you're on your way there.
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before the deciding point
아직 안 정했어요.
a-jik an jeong-hae-sseo-yo
I haven't decided yet.
At a fork, a foot that has not yet come down on either side.
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still going, longer than expected
그 식당 아직도 있어요?
geu sik-dang a-jik-do i-sseo-yo
Is that restaurant still around?
A shop sign you assumed had gone by long ago, still standing there on the timeline.
아직도 adds surprise that it has lasted this long.
All of it in one picture
아직 is a position marker dropped on a timeline that keeps moving. Make the mark arrival and the person is still on their way; make it closing and there is time left; make it fluent and you are partway down the road; make it decided and your foot has not yet come down at the fork. When a sign you thought had long since passed is still standing there, it becomes 아직도. In none of these does it say not at all — only that you stand before the point. That is why 아직 always leaves the feeling of a line still rolling forward.