how后面加什么动词什么形

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、

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。