Prefiero estudiar en casa.

Questions & Answers about Prefiero estudiar en casa.

Why is there an "i" in prefiero? The verb is preferir.
Preferir is a "stem-changing" verb. When you conjugate it for "I" (and most other forms), the second e changes to ie. So, instead of "prefero", it becomes prefiero.
Where is the word for "I" in this sentence?
In Spanish, the verb ending usually tells you who is doing the action. Since prefiero ends in -o, it already means "I prefer." You can add the word yo at the beginning, but native speakers usually leave it out unless they want to add emphasis.
Why doesn't this sentence need a word for "to" before "study"?
The Spanish dictionary form of a verb (the infinitive), like estudiar, already means "to study." When you put two verbs together like this—"I prefer" (prefiero) and "to study" (estudiar)—the second verb simply stays in its infinitive form.
Why is it just en casa and not en la casa?
En casa is a common fixed phrase that translates to "at home." If you said en la casa, it would mean "in the house," sounding like you are talking about a specific physical building rather than just being home.

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