Tienes una postura terrible cuando corres.

From Lesson 322:Working Out·Spanish (Spain)

Questions & Answers about Tienes una postura terrible cuando corres.

Why is corres in the regular present tense instead of the subjunctive?
The word cuando (when) only triggers the subjunctive mood when you are talking about a future or uncompleted action. Because this sentence describes a general habit or ongoing fact, it takes the normal present tense (the indicative mood) corres.
Why does terrible come after postura?
In Spanish, descriptive adjectives like terrible usually follow the noun they modify. Since it tells us what kind of posture it is, it comes after the noun, unlike in English where it comes before.
Do I have to use the article una here?
Yes. Just like in English, when you are describing a singular, countable noun like postura (posture) with an adjective, you generally need to use an article before it.

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