What's the difference between "Yo estoy..." and "Estoy..."
If "Yo estoy" and "Estoy" both mean I am, what's the purpose of adding the "Yo"?
3 Answers
Sometimes people add the "Yo" for emphasis. It's similar to using an exclamation mark. For example:
"Yo estoy enojado." which means "I am angry." or
"No me quieres, pero Yo te quiero." which means "You don't love me, but I love you."
You are right in that the subject pronouns are not normally used in Spanish. However, in some contexts, there may be some confusion, as in the imperfect conjugations (1st and 3rd person conjugations are the same). In these cases, many times the "yo" can be used for clarity.
Also, it can be added to emphasize the effect of the verb. Example: One person says "Hablo dos idiomas". The second prson responds, "Pues, yo hablo tres idomas".
Nothing, using yo makes it more repetitive you don't need it.