一、指代不同
1、a lot:许多。
2、a lot of:很多的。
二、语法不同
1、a lot:a lot不可作状语,修饰动词,表示数量上的“多”或“经常”。
2、a lot of:a lot和lots可用来修饰形容词或副词的比较级,表示程度。
三、侧重点不同
1、a lot:a lot of和lots of既可接可数名词,也可接不可数名词,多用于肯定句。
2、a lot of:后接不可数名词或者可数名词复数。
a lot
1、It costs a lot to buy a house in this part of the city.
在城市这个地段买房很贵。
2、However you look at it, it's going to cost a lot.
不管你怎么看,它都要花很多钱。
3、You used to see a lot of her, didn't you?
你过去常见她吧?
a lot of
1、By dancing you may make a lot of friends.
通过跳舞您可以交许多朋友。
2、He has given us a lot of help.
他给了我们许多帮助。
3、Alum has a lot of USES. This is only one of them.
明矾有许多用法,这只是其中一种。