Es peligroso usar la pesa descalzo.

Questions & Answers about Es peligroso usar la pesa descalzo.

Why is the word pesa used here instead of peso?
In Spanish, el peso refers to the abstract measurement of weight, like your body weight, or the currency. When talking about a physical piece of gym equipment like a dumbbell, kettlebell, or barbell, you must use the feminine noun la pesa.
Since no specific person is mentioned, why does the adjective descalzo end in "-o"?
When you make a general statement using an infinitive verb like usar, any adjective describing the implied person defaults to the masculine singular. If you were speaking specifically to a woman about her own actions, it would change to Es peligroso usar la pesa descalza.
The English translation says "to use". Could I also translate the phrase "Using the weight barefoot is dangerous" by using Usando?
No, Spanish never uses the gerund (words ending in -ndo) as the subject of a sentence. Whenever English uses an "-ing" word as a noun or subject, Spanish requires the infinitive form, which is why we must use usar here.
Why isn't there a preposition like de between peligroso and usar?
In the impersonal structure es + [adjective] + [infinitive], the infinitive is actually the subject of the sentence, so it attaches directly without a preposition. You only use de if a specific noun comes first and becomes the subject, such as La pesa es peligrosa de usar.

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