"Tú cierras la puerta."
Translation:You are closing the door.
These indicative sentences are interesting, given that they are in the Requests 1 skill.
If this is a request in the indicative, then it should not be translated as you are closing the door. Rather, with emphasis, you close the door.
At least that is how I understand the indicative used as a command.
I think ... the second person (tu) is being used in Requests 1 to make a point. You can use a 3rd person verb to make a simple request - but not a second person. "Tu cierras la puerta" is not a request to close the door. But "Cierra la puerta" has two meanings, one of which is: "Close the door". I am still learning, but I think this is right.
You are right. Translation is "You close the door". The answer doulingo gives is " Tu estas cierrando la puerta". I encountered a lot of answer in this form.