Tras when to use it
How to use the word tras in a sentence?
The Spanish preposition tras, usually meaning "behind" or "after," isn't a particularly common preposition. In fact, you could probably get by without even using it, as the prepositional phrases detrás de ("behind" in location) and después de ("after" in time) can usually be used instead. Tras is more common in writing than in speech. Even so, tras has significant use in journalese (it's a shorter word to use in headlines) and in a few phrases such as uno tras otro (one after the other) and día tras día (day after day).
"Tras que éramos pocos, parió la abuela!!!" (It's a popular saying)