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If I want to say "these things have been studied" would I use passive voice, as in "se han estudiado?"

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2 Answers 2

"Han sido estudiadas" is the true passive voice.

"Se han estudiado" is reflexive.

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Estas cosas han sido estudiadas.

As it's a plurar form

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So using ser is better here than the passive voice? –  user2493 Feb 11 '14 at 5:55
well really you can also use "Estas cosas se han estudiado". That depends, the one used in my answer is mostly used to says that something have been "fully" studied, in the past. This other way you means that it's something that it's still being studied. (sorry for my english) –  hmartinezd Feb 11 '14 at 6:11

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