Learn Spanish (Spain): Mi hermana vivirá en Madrid.

Unlike most tenses in Spanish where you chop off the ending, the simple future tense is built by taking the entire infinitive verb (like vivir) and adding the new ending directly to it. For he, she, or it, the ending is -á, which gives us vivirá (she will live).

Is the accent mark on the last letter of vivirá important?

Yes, it is crucial! Without the written accent, the spoken stress would fall on the second-to-last syllable, which sounds incorrect to a native speaker. The accent tells you to stress the very last sound, which is the standard pronunciation pattern for this future tense.

Could I also say Mi hermana va a vivir en Madrid?

Yes! You probably already know how to use ir a plus an infinitive to say what is going to happen. Va a vivir (she is going to live) and vivirá (she will live) mean almost exactly the same thing and are both perfectly natural to use in Spain.

Why do we use en here for a city instead of a?

In Spanish, en is used for a static location, meaning in, on, or at a place where someone is currently resting or staying. You would only use a (to) if there was physical movement toward the city, like Mi hermana viajará a Madrid (My sister will travel to Madrid).