Learn Polish: Ewo, powinnaś zacząć prasować swoje ubrania. - Ewa, you should start ironing your clothes.

Words about starting and finishing follow a strict rule in Polish: the action you are starting must always be in its imperfective form, because you are beginning a continuous process. So we use the imperfective prasować (to iron). However, zacząć (to start) is perfective here because the act of starting is viewed as a single, completed transition.

Why is the sentence addressed to Ewo instead of just using her name, Ewa?

When you speak directly to someone or call out to them in Polish, you use the Vocative case. For most feminine names ending in -a, like Ewa, this case changes the final letter to -o, giving us Ewo.

How does the word powinnaś tell us we are talking to a woman?

The word for "should" changes based on the gender of the subject. If we were telling a man he should do something, we would use powinieneś. Because Ewa is female, we use the feminine "you" form, powinnaś.

Why does the sentence use swoje instead of twoje for "your" clothes?

swoje is a reflexive pronoun meaning "one's own". Whenever the person doing the action is also the owner of the object, Polish requires you to use a form of swój. Since Ewa (the subject) is ironing her own clothes, swoje is the correct choice.