Sentí a mi amiga suspirar de alivio.

Questions & Answers about Sentí a mi amiga suspirar de alivio.

Why use the infinitive suspirar here instead of the gerund suspirando?
In Spanish, using an infinitive like suspirar after a perception verb (sentí) means you experienced the action as a complete event from start to finish—you felt her let out a single sigh. If you used the gerund (suspirando), it would mean you felt her in the middle of an ongoing action, as if she were continuously sighing.
Why is there an a before mi amiga?
This is the personal a. Even though your friend is the one sighing, grammatically she is the direct object of the verb sentí (she is the person you felt). Since she is a specific person receiving the action of a verb, the personal a is required.
Why do we say de alivio instead of using en or con for 'in relief'?
Spanish often uses the preposition de to indicate the emotion or physical state that causes a physical reaction. Just like llorar de alegría (to cry with joy) or temblar de miedo (to tremble with fear), you sigh 'from' relief (de alivio).
Can the word order change? Could I say Sentí suspirar a mi amiga?
Yes, absolutely. With perception verbs plus an infinitive, it is very common to put the infinitive right after the conjugated verb. Sentí a mi amiga suspirar and Sentí suspirar a mi amiga are both completely natural and mean the same thing.

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