Nadie sobrevivirá en aquel planeta oscuro si falta el oxígeno.

Questions & Answers about Nadie sobrevivirá en aquel planeta oscuro si falta el oxígeno.

Why does sobrevivirá have an accent mark at the end?
In the future simple tense, regular verbs add their endings directly to the full infinitive. For the he/she/it form, which also goes with nadie, the ending is . This ending always takes an accent mark to show the spoken stress lands on that final syllable.
Why is it aquel planeta oscuro and not aquella planeta oscura since planeta ends in -a?
Planeta is a tricky exception. Even though it ends in -a, it is a masculine noun (el planeta). Because of this, any descriptive words attached to it must also be masculine, which is why we use aquel and oscuro.
Why use aquel for "that" instead of ese?
Both words mean "that", but Spanish has two levels of distance. You use ese for things fairly close to you or the listener, and aquel for things that are very far away in space or time. Since they are talking about a distant planet, aquel is the best choice.
Why does the sentence say el oxígeno when the English translation just says "oxygen"?
In Spanish, when you talk about a general substance, category, or concept as the subject of a sentence, you almost always need to include the definite article (el, la, los, las). Because oxygen in general is being discussed here, it needs the el.
How does the verb falta work in this sentence?
The verb faltar means "to be missing" or "to lack". Here, el oxígeno is the subject of that verb. So si falta el oxígeno translates smoothly to "if oxygen is missing" or "if there is a lack of oxygen".

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