"La porta rimane aperta."
Translation:The door remains open.
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"aprire" is the infinitive form of the verb => "to open" , in English.
"apre" is the 3rd person singular conjugation of the present tense indicative form of "aprire" => he opens, she opens, it opens.
io apro, tu apri, lui/lei apre, noi apriamo, voi aprite, loro aprono
"aperto/aperta/aperti/aperte" are adjectives and have to match what they are describing in gender and number.
Il porto è aperto. The door is open.
I porti sono aperti. The doors are open.
La scatola è aperta. The box is open.
Le scatole sono aperte. The boxes are open.
la porta = the door (as well as a few other meanings: http://www.wordreference.com/iten/porta)
l porto = the port or harbor (as well as a few other meanings: http://www.wordreference.com/iten/porto)