Learn Portuguese (Portugal): A médica não abre a janela. - The doctor does not open the window.

When conjugating regular -ir verbs for he, she, or it (the third person singular) in the present tense, the ending is actually -e. You drop the -ir from abrir and add -e to get abre (opens). It shares this exact same ending with regular -er verbs!

Why is there no translation for the word "does" in the Portuguese sentence?

Portuguese does not use helper verbs like "do" or "does" to make a sentence negative. To say "does not open", you simply place não (not) directly in front of the main verb: não abre.

How do we know from the Portuguese sentence that the doctor is female?

Professions in Portuguese usually change their ending based on gender. The word for doctor is médico for a man and médica for a woman. The word for "the" must also match this feminine gender, which is why the sentence starts with A médica.