Financially, parents are expected to provide food and clothing for their child.
The infinitive phrase in this sentence is to speak clearly, and it is used as a subject of the sentence. What/who is essential to being understood? To speak clearly.
The animation "Moana" presents a captivating and inspiring story, as it presents a brave and gentle girl, who to prevent her people from going through needs embarks on a great adventure, full of dangers and uncertainties. Despite the problems that Moana faces, she does not shy away from her responsibilities and faces her own fears knowing that it will promote a wonderful result for her, her family and the people for whom she is responsible.