there are a lot of differences这句话对不?a 不是用is 么?这怎么用are?

there are a lot of differences这句话对不?a 不是用is 么?这怎么用are?
there are a lot of differences
这句话对不?
a 不是用is 么?这怎么用are?

there are a lot of differences这句话对不?a 不是用is 么?这怎么用are?
a lot of 是固定短语,表示许多的意思.不能只看a

用there are many differences比较好。

完全正确。