Question 1

Why do we say a uno le duelen instead of just uno duele?

Accepted Answer

The verb doler (to ache or hurt) works just like gustar. The body part causing the pain is actually the grammatical subject of the sentence, and the person feeling the pain is the indirect object. We use a uno to specify 'to one' as a generic reference, and the mandatory indirect object pronoun le must match it. Literally, it translates to 'the hands cause pain to one'.

Question 2

If uno is singular, why is the verb duelen conjugated in the plural?

Accepted Answer

Because the subject of duelen is not uno, it is las manos (the hands). Since the hands are plural, the verb must also be plural. The pronoun uno is merely the indirect object receiving the action.

Question 3

Why does the sentence use las manos instead of sus manos to mean 'one's hands'?

Accepted Answer

In Spanish, you almost always use definite articles (el, la, los, las) instead of possessive adjectives when talking about body parts. Because the indirect object pronoun le already makes it perfectly clear whose hands are hurting, adding sus would be redundant and sound unnatural.

Question 4

How does the tan ... que structure work here?

Accepted Answer

It uses the correlative structure tan + [adjective] + que, which maps perfectly to the English structure 'so [adjective] that'. In this sentence, it connects the cause (el calor es tan extenuante) directly to its extreme result (que a uno le duelen las manos).

El calor es tan extenuante que a uno le duelen las manos.

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