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Medical
students must remember that it is not easy to be a good doctor or a nurse. They
must have not only deep knowledge of a particular field of medicine, they must
also love people and have a kind heart. They must give all their knowledge, all
their abilities, all their talent and all their time to people, to the
protection of their health.

Medical
students must understand well all the difficulties of their future profession.
They must remember that to treat a patient is a great art but not an ordinary
trade.

1. He has been away from his studies all this week. – Он не занимался учебой всю эту неделю (Present Perfect потому что действие связано с настоящим (this week))  

2. Bill had worked extremely hard before he entered college. - Билл очень много работал, прежде чем поступить в колледж. (Past Perfect потому что одно действие в произошло перед другим действием в

3. Has she seen her parents since she got married? - Видела ли она своих родителей с тех пор, как вышла замуж? (Present Perfect, потому что есть указание времени since)

4. Why have you put your coat on? It’s not cold. - Почему ты надел пальто? Сейчас не холодно. (Present Perfect потому что действие связано с настоящим (it is not cold)