how为连接副词，引导名词性从句，后动词可为；一般现在时：动词单数形；一般过去时：动词过去式；还可接情态动词.
相关介绍：
Now let me see ─ how old is she now?
让我想一想，她现在多大了呢？
How much will it cost, more or less?
这个大概得花多少钱？
I don't know how you can say things like that.
真想不到你怎么会说出这种话来。
How many people were there?
有多少人？
In this class, students will learn how to program.
这节课学生将学习编程。
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