会/能/可以
huì / néng / kěyǐ
Three locks on the same door marked can
The picture One door labelled I can, with three locks on it. 会 opens with what you have learned, 能 with what your body and your day allow, 可以 only when someone else turns the key.
Where the picture shows up in 会/能/可以
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the lock learning opens
我会开车，可是今天喝酒了。
wǒ huì kāichē, kěshì jīntiān hē jiǔ le
I do know how to drive, but I've been drinking today.
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the lock circumstances jam
今天我不能加班，得去接孩子。
jīntiān wǒ bù néng jiābān, děi qù jiē háizi
I can't stay late today — I have to pick up my kid.
Use 不能 when the situation blocks you, not your skill.
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the key someone else holds
请问这儿可以抽烟吗？
qǐngwèn zhèr kěyǐ chōuyān ma
Excuse me, is smoking allowed here?
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how much your body can put out
他一天能走两万步。
tā yì tiān néng zǒu liǎng wàn bù
He can walk twenty thousand steps a day.
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the way things already go
天气预报说明天会下雨。
tiānqì yùbào shuō míngtiān huì xià yǔ
The forecast says it'll rain tomorrow.
会 is what has been learned into something, so it also covers what the world reliably does — that is, will.