a lot of ：许多，大量.【既修饰可数名词，也可以修饰不可数名词】.后接名词、代词或名词词性法语名词性词组.
A lot of people haved done it successfully.
A lot of water has been used up.
a little：有一点有一些.【修是不可数名词】.
a little 少许， 一点
a lot of 很多
Preparing a good breakfast doesn't require a lot of time， just a little planning should do the trick.
a little 不可接可数名词 （要用 a few + 可数名词)
a lot of 可接可数名词， 如 a lot of buildings have been erected last year.
