跑得很快-correct
跑的很快-wrong, because the phrase should be:V + 得 + adv +adj
跑地很快-wrong because the phrase should be: V + 得 + adv. + adj.
For example:
唱得很好
说得很好
跳得很好
跑得很快-correct
跑的很快-wrong, because the phrase should be:V + 得 + adv +adj
跑地很快-wrong because the phrase should be: V + 得 + adv. + adj.
For example:
唱得很好
说得很好
跳得很好
跑得很快:is the standard way in grammar of V.+得+ Adv.
跑的很快:could be the simplified way in speaking. The original structure is this: 跑的速度很快
No sense about 跑地很快. in grammar, Adv.+地+V. 很快地跑
Anyway, you are right. 的,地,得 they are subtle in grammar. But they are almost the same pronunciation in speaking.
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