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"Tu" is a form of "tu", an adjective which is often translated as "your". "En el trabajo" is a phrase which is often translated as "at work". Learn more about the difference between "en el trabajo" and "tu" below.
tu(
too
)An adjective is a word that describes a noun (e.g., the big dog).
1. (informal) (possessive)
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).