The phrase "Marcos will close the door" means "Marcos cerrará la puerta".
The original sentence "Marcos will close the door" is in the future as indicated by "will", which means the action has not happened again.
This tense has a specific conjugation depending on the subject; here is an example:
In this case, Marcos is equal to "él", therefore, the correct phrase would be "Marcos cerrará".
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