How many days did you take off?
你休了几天假？
How many children do you have?
你有几个孩子？
Please let me know how many are coming, if any.
请告诉我，如果有人要来的'话，有多少？
Whether we need more food depends on how many people turn up.
我们是否需要更多的食物，这要视到场人数而定。
How many people came to the meeting?
多少人来参加了会议？