我们可以从“how”的词义和用法入手。一般来说，“how”可以表示“如何”、“怎样”、“多少”等意思，例如：“How did you learn to speak English ”

（你是怎么学会说英语的？）、“How much money do you have ”

1、How many people were there

有多少人？

2、How much thickener is used

用了多少增稠剂？

3、How does this machine work

这部机器是如何工作的？