Скажи, почему они счастливы, используя Present Perfect.

Конечно, вот ответы, использующие Present Perfect: 1. James is happy because he **has done** his homework and can go to the cinema with his friends. 2. Peter is happy because he **has swum** 100 metres in two minutes. 3. Samantha and Jenny are happy because the bell **has rung**. There are no more classes and they can go home. 4. Tom and Roy are happy because they **have seen** a film with their favourite actor, Jackie Chan. 5. Pauline is happy because her mum **has come** home early today and they are having dinner together. 6. Jack is happy because he **has become** captain of his football team. 7. Mary and Kate are happy because they **have been** to New York and **have enjoyed** it. 8. Anna is happy because she **has begun** learning French. 9. Peter is happy because he **has run** into the classroom before the bell. It's the first time when he hasn't been late for his lessons. 10. Julia is happy because she **has played** her favourite sonata on the piano very well.