得
de
得 is a window that opens behind the verb
The picture You say the verb, and a window swings open behind it. Through that window you see how it turned out.
Where the picture shows up in 得
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the window shows how fast
他跑得很快。
tā pǎo de hěn kuài
He runs really fast.
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the window shows if it landed
你说得对。
nǐ shuō de duì
You are right about that.
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the window shows how well
我昨天晚上睡得不好。
wǒ zuótiān wǎnshang shuì de bù hǎo
I slept badly last night.
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the window shows if it is possible
这个箱子我搬得动。
zhège xiāngzi wǒ bān de dòng
I can move this box myself.
Verb plus 得 plus result means you can reach that result. The negative is 搬不动.
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the window shows the timing
你今天来得太早了。
nǐ jīntiān lái de tài zǎo le
You have come far too early today.
Before the verb it is 地; after the verb it is 得. 慢慢地走 is how the walking looks, 走得很慢 is how the walking turned out.