there is another chapter where "Having done something" with the action as subject or direct object of a sentence using El Infinitivo Compuesto (= haber + participle)
How does it differ from using infinitive?
Fumar es malo para la salud
Haber fumado es malo para la salud
if I were to guess, I am guessing that using el infinitive compuesto is that, the action was indeed being carried out where as using infinitive is just a general statement. the person we are warning regarding smoking is bad, did not smoke.
Whereas if the person indeed smoke, we will say haber fumado es malo para la salud
Yes, you're right. The use of the perfect infinitive indicates something that has already happened, while the simple infinitive doesn't carry that meaning.
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