Question 1

Why does al enganchar mean "upon hooking", and how do we know who is doing the hooking?

Accepted Answer

The structure al + infinitive is a shortcut for saying "when [something] happens" or "upon [doing something]". In this sentence, because no explicit subject is placed next to the verb, we naturally assume the person doing the hooking is the subject of the main clause: el capitán.

Question 2

What if someone else hooked the tuna? How would we show that using the al + infinitive structure?

Accepted Answer

You can add a different subject right after the infinitive. For example, if a sailor hooked the fish, you would say: Al enganchar el marinero el atún, el capitán acababa de parar el barco (Upon the sailor hooking the tuna, the captain...).

Question 3

Could I say cuando enganchó instead of al enganchar?

Accepted Answer

Yes, cuando enganchó el atún (when he hooked the tuna) means the exact same thing. However, al + infinitive is a very common, elegant shortcut that native speakers use frequently to compress a "when" clause without having to conjugate a second verb.

Question 4

Why is acabar in the imperfect tense (acababa) here?

Accepted Answer

The phrase acabar de + infinitive means "to have just done" something. To say someone had just done something in the past, you must use the imperfect tense (acababa de parar). The present tense (acaba de parar) means he has just stopped it, while the preterite (acabó) is generally not used for this specific "had just" idiom.

Al enganchar el atún, el capitán acababa de parar el barco.

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