Learn German: Wieso kommst du nicht? - How come you are not coming?

Yes! Both wieso and warum mean 'why'. Wieso is often translated as 'how come' and is very popular in everyday spoken German. At this level, you can use them interchangeably.

Why is the verb kommst right after the question word?

In German W-questions, the verb is always in the second position. The question word (wieso) takes the first spot, so the verb (kommst) must come next, followed by the subject (du).

Why does nicht go at the very end of this sentence?

When you want to say that a whole action is not happening, nicht (not) usually goes at the end of the sentence. Here, it negates the entire idea that you are coming.

Why does the verb end in -st here?

The dictionary form of the verb is kommen (to come). Because the subject is du (the informal 'you'), we drop the -en ending and add -st to make kommst.