Echarse + a + infinitive  is an example of Spanish Verbal Periphrasis.

Did you know that you can use estar to talk about the temperature in Spanish? estamos + a + number + degrees  

 Here are 3 Spanish expressions that begin with the preposition por.

 Here is a great blog post about the uses of the Spanish verb estar from Tell Me in Spanish . When to Use Estar in Spanish: 10 Uses to Master this Verb - Tell Me In Spanish