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Yes, "a" should always be included when talking about knowing people. It is not used with objects, though: Nosotros conocemos el lugar


I'm a chilean native speaker and I disagree with Duolingo. That phrase can either mean "I'm introducing the students (to someone)" or "I'm presenting (some information) to the students"/"I'm giving a presentation to the students". When I first read the phrase I immediately thought of "I'm presenting to the students". Either answer should be correct.


If you say "I present to the students" you are implying that you will show something to the students. Example: I present to the students the new book "Yo presento a los estudiantes" means that you are introducing each and everyone of the students. I agree with Duolingo on this one.


Yes. When the direct object is a person, or several, you use "a" before the object.


I don't think it could. «Presentar» (introduce) goes with either DO, or both DO and IO, but not IO only. Translating it as «They present to their families» would leave the Spanish sentence in a cliff: «ellas presentan [a quién] a sus familias», they present whom to their families? As for the different ways of expressing two actions, I'm not quite sure ...


In Spanish, when the direct object is a specifically referenced person, it is preceded by the preposition "a" (called the "personal a"). This word has no English translation but is important in Spanish. You also use this when referring to a pet (I can only assume that Spanish recognizes the importance of pets in our lives). Note that "specific" does not ...

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