▲问及人口除了用What is the population of...? 外，还可用How many people ...? 这两种问句一般涉及较大范围，如某个国家、地区或城市的人口。

▲如果问及较小范围，如家庭、党派、组织、团体、球队、俱乐部、代表团等的人数，用How many people ...? 或How many persons ...? 均可。例如：

How many persons are there in your family?   你家有几口人?

How many persons will there be in your party.  您一行共有几人?

How many persons are there in your group, sir?  先生，你们小组共有几位?

How many persons are there on each side?  比赛双方人数是多少?

How many persons do you have in your club? 你们俱乐部有多少人？

How many persons will take part in the competition? 有多少人参加比赛？

以上各句，persons 也可换为people。