How to Say "i join" in Spanish
The Spanish word for “i join” is “entro” — B1 level.
English → SpanishB1
VerbB1
Joining a group or activity

Examples
La próxima semana entro en un nuevo proyecto.
Next week I start a new project.
Si no duermo bien, entro fácilmente en un estado de mal humor.
If I don't sleep well, I easily fall into a bad mood.
Abstract Entry Rule
When 'entro' means starting an abstract thing (a job, a mood, a discussion), it almost always needs the preposition 'en': 'entro en el tema' (I get into the topic).
Missing Preposition
Mistake: “Entro mi nuevo trabajo.”
Correction: Entro en mi nuevo trabajo. (You need 'en' to link the action to the abstract thing you are starting.)
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