Can an adverb modify another adverb in Chinese? I was wondering if an adverb in Chinese can be used to modify another adverb. I looked some resources but I could not find it. For example, in Adverb in resources.allsetlearning, they just say &quot;Adverbs are words that modify verbs and adjectives.&quot;.
In particular, I was thinking in English you can say You speak too fast, where too is an adverb that modifies the adverb fast.
In Chinese, I know 快 can either be an adjective or an adverb.

We could translate the previous English sentence to Chinese as:

你说得太快。
Nǐ shuō de tài kuài.
You speak too fast.

But here, 快 works as an adjective as it follows the structure Verb + 得 + 太 + Adj.

Moreover, I think you can also say:

你快说。
Nǐ kuài shuō.
You speak fast.

Here 快 is an adverb.

I was wondering if it is also possible to say:

你太快说。
Nǐ tài kuài shuō.
You speak too fast.

Where both 太 and 快 would be adverbs.
we don't say 你太快说

你说得太快

means you speak too fast

你快说

expresses that I want you to speak faster, it's like a request.
你快说 can be used on informal occasions (with your friends or your family). We don't say it to people you are not familiar with, they would think you are being impolite and inpatient.
You can say &quot;你可不可以快点说？“ This sentence is better than 你快说. It's more polite and good attitude.