Learn German: Da das Tattoostudio voll ist, kommt der Tätowierer helfen. - Since the tattoo parlor is full, the tattoo artist comes to help.

Because kommen is a verb of motion. In German, verbs of motion like kommen and gehen, verbs of perception like sehen and hören, and the verb bleiben pair directly with a bare infinitive. You don't need zu; you just put the infinitive helfen at the end of the clause.

Why is the main verb kommt placed right after the comma?

This is because of the verb-second rule. The entire first part of the sentence, the Da... clause, acts as the first position. To keep the main verb in the second position, kommt has to appear right after the comma, pushing the subject (der Tätowierer) after it.

Could I use weil instead of da in this sentence?

Yes! Both da and weil send the conjugated verb to the end of their clause and mean because or since. Da is often preferred at the beginning of a sentence, much like how we use since in English to state a reason that sets the stage.

How do we know the gender for a modern word like Tattoostudio?