There are a lot of staff or there are a lot of staffs

There are a lot of staff or there are a lot of staffs
There are a lot of staff or there are a lot of staffs

There are a lot of staff or there are a lot of staffs
Staff是集合名词 用staff就行

有很多员工或员工的有很多

There are a lot of staffs.
There are lots to staffs.
a lot of 和 lots of 后面既可以接可数名词又可以接不可数名词。
a good (great) deal of 一般与不可数名词连用。
a great (good) many 与 a great number of 后面接普通名词, 动词用复数形式...

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There are a lot of staffs.
There are lots to staffs.
a lot of 和 lots of 后面既可以接可数名词又可以接不可数名词。
a good (great) deal of 一般与不可数名词连用。
a great (good) many 与 a great number of 后面接普通名词, 动词用复数形式。
plenty of 可与各种名词连用, 但与不可数名词连用时, 动词用单数形式, 与可数名词连用时, 动词用复数形式, 即述语动词的单复数取决于 plenty of 后面的名词的单复数。

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