объясемте срочно как складывать и вычитать неправильные дроби​

You have got a letter from your English-speaking pen friend Steve ... Next year i will go to the sixth from where i will learn Math,informatoin Technology,English and two more subjects-which ones,i haven't decided yet.I want to get into Oxford.It is rather difficult and you need to work hard. What opportunities do you have when you choose where to study?What are your plans for the future?What subjects are you interested in? Write a letter to Steve and answar his quetions.Ask him three questions about Bretish cshools.You have 20 minutes to do this task.Write 100-140 words. Вообщем,тут надо написать письмо и ответить на вопросы!)

проверьте пожалуйста.

1. I have been hearing of him ever since I was born.

2. By the time you arrived we have left.

 3. The students will have knowing the results of the examination by 3 o'clock tomorrow.

4. By 5 o'clock the Congress had adopted the draft program.

5. After they have presented the draft of the Program, long debates took place.

6. I have did already all my lessons.

7. He has rejected just our proposal.

8. Our family have living in this street since we got a new flat.

звуко буквенный анализ слов щепка,вечер