Learn Italian: La coppia cammina insieme nel parco. - The couple walks together in the park.

In Italian, collective nouns like la coppia (the couple), la famiglia (the family), or il gruppo (the group) are grammatically singular. They always take a singular verb. While in English you might hear "the couple walk", in Italian it must be la coppia cammina.

Could I use passeggia instead of cammina here?

Yes! Passeggiare means to stroll or to walk for pleasure, which fits perfectly with a couple in a park. Camminare refers to the general physical action of walking. Either one works well, but passeggia emphasizes that they are taking a leisurely stroll.

How would I turn this into reported speech if someone asked, "Is the couple walking in the park?"

To report a yes/no question, you use se (if/whether). For example: Ha chiesto se la coppia camminava nel parco (He/She asked if the couple was walking in the park). Because the reporting verb (ha chiesto) is in the past, the present tense cammina shifts a step back into the past, becoming the imperfect tense camminava.

Why is it nel parco rather than just in parco?