Questions & Answers about Voy a atar los globos a la silla.
It is the ir a + infinitive structure, which is a very common way to talk about the near future or an intended action.
- voy = I go
- a = part of the future structure here
- atar = to tie
So voy a atar means I’m going to tie.
This is extremely common in everyday Spanish, often more common in speech than the simple future.