一共有几个？用英语怎么说？

How many+可数名词的复数？
How much+不可数名词？

都表示一共有几个

一共有几个？
How many all ?

How many pieces all together?
共有多少件？
How many persons, please?
请问一共有几位？
How many of you will come to the dinner?
共有几位客人？

How many in all ?

How many ...(选填noun) in totall?