“there is a lot of”还是“there are a lot of "

a lot of是口语和书面语中最常见的用语,它既可以修饰可数名词（相当于many）,也可以修饰不可数名词（相当于much）,通常用在肯定句中,例如：
There are a lot of books in the library．复数
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There is a lot of people here at the small park.单数
此句因看a lot of后修饰是单数还是复数