a

lot做副词时＝very

much

eg：Thanks

a

lot。＝Thank

you

very

much.

a

lot

of=lots

of都表示“许多、大量”后面可以接可数名词也可以接不可数名词。

eg:

a

lot

of

water=lots

of

water

a

lot

of

books=lots

of

books