--Can you dance?--Yes,I can do it (a little).

先看一下a little 的用法

a little在肯定句中修饰动词、形容词、副词和比较级时,表示"一点儿"的意思.例如:
That's a little too expensive. 那有点太贵了.具体在这句话中I can do it (a little).表示,我可以跳一点,我会跳一点舞.

a little在否定句中的意思,not a little相当于"very(much)"或"extremely"(很、非常).例如:
She is not a lia little 只修饰不可数名词；ttle tired.  她很累
a little bit of 或是a bit of 都表示很少

再看一下very much的用法：very much是 much 的强调说法,从理论上说,可用 much 的地方,原则上也可 very much.

much 的用法much主要修饰动词,而且除非其前有very, too, so 等修饰语,它只用于否定句和疑问句：She doesn't like him much. 她不太喜欢他.Does she much like him? / Does she like him much? 她很喜欢他吗?She likes him very much. 他很喜欢他.

注意：(1)不带修饰语的much有时也可能在肯定句修饰动词,但这只限于 regret, admire, prefer, appreciate 等少数动词,且此时的 much 应置于句中,而不是句末：We much appreciate your invitation. 我们非常感激你的邀请.

2) much 除修饰动词外,还可修饰比较级和*以及介词短语等：He is much better today. 他今天好多了.This is much the most difficult. 这是最最困难的.Much to my surprise, he was a thief. 使我大Much to my surprise, he was a为吃惊的是,他是个贼.

在这里very  much 修饰的动词是表达主观感受的,比如thank、 like、hate等,而是一般的行为动词,所以应该选择very well ,而不是very much

不清楚的请继续发问!