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a lot of / lots of

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a lot of / lots of

There is a lot of water.
There is a lot of books.
There are lots of books.
There is lots of water.
这是我的猜想.
这里的there be句型中的be 是根据a lot of、 lots of 的变化而变,还是根据后面那个名词的变化而变?
如果说根据a lot of、 lots of 的变化而变,那么 a lot of 时用is lots of 时用are
如果说根据后面的名词的变化而变,那就是不可数用is 可数用are?
lots 不单独用的,lots of=a lot of 后面接可数名词和不可数名词均可,接可数名词时谓语用复数,接不可数名词时,谓语用单数.
a lot 当然不是名词性短语了,而是副词性短语,修饰动词.比如:Thanks a lot.= Thanks very much.
再比如:I know him a lot.
plenty of 和以上lots of 和a lot of相似,后面接可数名词和不可数名词均可,接可数名词时谓语用复数,接不可数名词时,谓语用单数.
而复数变化是根据后面名词的单复数而定